NOSNOW: Tighten snowflake-connector-python upper bound to <5.0.0a0

[sfc-gh-helmeleegy]

1. Which Jira issue is this PR addressing? Make sure that there is an accompanying issue to your PR.

   Fixes SNOW-NNNNNNN

2. Fill out the following pre-review checklist:

   • I am adding a new automated test(s) to verify correctness of my new code
     • If this test skips Local Testing mode, I'm requesting review from @snowflakedb/local-testing
   • I am adding new logging messages
   • I am adding a new telemetry message
   • I am adding new credentials
   • I am adding a new dependency
   • If this is a new feature/behavior, I'm adding the Local Testing parity changes.
   • I acknowledge that I have ensured my changes to be thread-safe. Follow the link for more information: Thread-safe Developer Guidelines
   • If adding any arguments to public Snowpark APIs or creating new public Snowpark APIs, I acknowledge that I have ensured my changes include AST support. Follow the link for more information: AST Support Guidelines

3. Please describe how your code solves the related issue.

   Tighten snowflake-connector-python upper bound to <5.0.0a0.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.27%. Comparing base (d4e00e4) to head (2f743d3).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4224      +/-   ##
==========================================
+ Coverage   95.04%   95.27%   +0.23%     
==========================================
  Files         171      171              
  Lines       43877    44158     +281     
  Branches     7525     7535      +10     
==========================================
+ Hits        41703    42073     +370     
+ Misses       1368     1295      -73     
+ Partials      806      790      -16     

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[sfc-gh-helmeleegy]

Closing without merging per this slack discussion: https://snowflake.slack.com/archives/C0B21UJUFNF/p1778688009492329