Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -8,7 +8,7 @@ jobs:
     name: cargo build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@nightly
       - run: sudo apt-get update
       - run: sudo apt-get install -y pkg-config libudev-dev
@@ -18,7 +18,7 @@ jobs:
     name: cargo test
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@nightly
       - run: sudo apt-get update
       - run: sudo apt-get install -y pkg-config libudev-dev
@@ -31,7 +31,7 @@ jobs:
     env:
       RUSTDOCFLAGS: -D warnings
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@nightly
       - run: sudo apt-get update
       - run: sudo apt-get install -y pkg-config libudev-dev

.github/workflows/formatting.yaml

@@ -8,7 +8,7 @@ jobs:
     name: cargo fmt
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@nightly
         with:
           components: rustfmt

.github/workflows/lint.yaml

@@ -8,7 +8,7 @@ jobs:
     name: clippy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@nightly
         with:
           components: clippy
@@ -20,7 +20,7 @@ jobs:
     name: shellcheck
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Run ShellCheck
         uses: ludeeus/action-shellcheck@master
         with: