chore(deps): bump actions/checkout in the github-actions group

Bumps the github-actions group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `actions/checkout` from 5 to 6
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/cd.yml

@@ -40,7 +40,7 @@ jobs:
             target: x86_64-pc-windows-msvc
             features: '--no-default-features --features rodio_backend,pancurses_backend,share_clipboard,notify'
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         name: Checkout src
       - name: Install rustup
         if: runner.os != 'Windows'

.github/workflows/ci.yml

@@ -34,7 +34,7 @@ jobs:
             target: x86_64-pc-windows-msvc
             features: '--no-default-features --features rodio_backend,pancurses_backend,share_clipboard,notify'
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/cache@v4
         name: Cache build data
         with:
@@ -73,7 +73,7 @@ jobs:
     name: Running `cargo fmt`
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Install rustup
         run: curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
       - name: Install clippy + rustfmt
@@ -87,7 +87,7 @@ jobs:
     name: Running `cargo clippy`
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/cache@v4
         name: Cache build data
         with:

.github/workflows/update-rust-toolchain.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: update rust toolchain
         uses: a-kenji/update-rust-toolchain@v1.1
         with: