chore(deps): bump actions/checkout from 4.1.7 to 4.2.1

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.7 to 4.2.1.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@692973e...eef6144)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/swift-ci.yml

@@ -21,7 +21,7 @@ jobs:
  egress-policy: audit
 
  - name: Checkout Code
- uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+ uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
 
  - name: Install swift-format
  run: brew install swift-format
@@ -48,7 +48,7 @@ jobs:
  swift-version: ${{ matrix.swift }}
 
  - name: Checkout Code
- uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+ uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
 
  - name: Cache
  uses: actions/cache@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9 # v4.0.2
@@ -81,7 +81,7 @@ jobs:
  swift-version: ${{ matrix.swift }}
 
  - name: Checkout Code
- uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+ uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
 
  - name: Cache Code
  uses: actions/cache@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9 # v4.0.2