Bump sled from 0.26.3 to 0.28.0

[dependabot-preview]

Bumps sled from 0.26.3 to 0.28.0.

Release notes

Sourced from sled's releases.

async flush, bugfixes, event variant rename

Breaking Changes

• Event::Set has been renamed to Event::Insert and
  Event::Del has been renamed to Event::Remove. These
  names better align with the methods of BTreeMap from
  the standard library.

Bug Fixes

• A deadlock was possible in very high write volume
  situations when the segment accountant lock was
  taken by all IO threads while a task was blocked
  trying to submit a file truncation request to the
  threadpool while holding the segment accountant lock.

New Features

• flush_async has been added to perform time-intensive
  flushing in an asynchronous manner, returning a Future.

Changelog

Sourced from sled's changelog.

0.28

Breaking Changes

• Iter no longer has a lifetime parameter.
• Db::open_tree now returns a Tree instead of
  an Arc<Tree>. Tree now has an inner type that
  uses an Arc, so you don't need to think about it.

Bug Fixes

• A bug with prefix encoding has been fixed that
  led to nodes with keys longer than 256 bytes
  being stored incorrectly, which led to them
  being inaccessible and also leading to infinite
  loops during iteration.
• Several cases of incorrect unsafe code were removed
  from the sled crate. No bugs are known to have been
  encountered, but they may have resulted in
  incorrect optimizations in future refactors.

0.27

Breaking Changes

• Event::Set has been renamed to Event::Insert and
  Event::Del has been renamed to Event::Remove. These
  names better align with the methods of BTreeMap from
  the standard library.

Bug Fixes

• A deadlock was possible in very high write volume
  situations when the segment accountant lock was
  taken by all IO threads while a task was blocked
  trying to submit a file truncation request to the
  threadpool while holding the segment accountant lock.

New Features

• flush_async has been added to perform time-intensive
  flushing in an asynchronous manner, returning a Future.

0.26.1

Improvements

• std::thread is no longer used on platforms other than
  linux, macos, and windows, which increases portability.

... (truncated)

Commits

• See full diff in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Note: This repo was added to Dependabot recently, so you'll receive a maximum of 5 PRs for your first few update runs. Once an update run creates fewer than 5 PRs we'll remove that limit.

You can always request more updates by clicking Bump now in your Dependabot dashboard.

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Pull request limits (per update run and/or open at any time)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

Finally, you can contact us by mentioning @dependabot.

[dependabot-preview]

Superseded by #13.