Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

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

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

Author: dependabot[bot]

.github/workflows/cargo-build.yml

@@ -31,7 +31,7 @@ jobs:
       # Remove this when it no longer FTBFS on `ring` in CI.
       CARGO_PROFILE_TEST_BUILD_OVERRIDE_DEBUG: true
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions-rust-lang/setup-rust-toolchain@v1
       - name: Install dependencies
         run: |

.github/workflows/cargo-clippy.yml

@@ -30,7 +30,7 @@ jobs:
       # Remove this when it no longer FTBFS on `ring` in CI.
       CARGO_PROFILE_TEST_BUILD_OVERRIDE_DEBUG: true
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
           components: clippy

.github/workflows/cargo-fmt.yml

@@ -31,7 +31,7 @@ jobs:
       # Remove this when it no longer FTBFS on `ring` in CI.
       CARGO_PROFILE_TEST_BUILD_OVERRIDE_DEBUG: true
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
           components: rustfmt

.github/workflows/cargo-test.yml

@@ -28,7 +28,7 @@ jobs:
       # Remove this when it no longer FTBFS on `ring` in CI.
       CARGO_PROFILE_TEST_BUILD_OVERRIDE_DEBUG: true
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions-rust-lang/setup-rust-toolchain@v1
       - uses: taiki-e/install-action@cargo-llvm-cov
       - uses: taiki-e/install-action@nextest

.github/workflows/make-release.yml

@@ -13,7 +13,7 @@ jobs:
     name: make release
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: 'Authenticate to Google Cloud'
         uses: 'google-github-actions/auth@v2.1.7'
         with:
@@ -91,7 +91,7 @@ jobs:
     needs: [makerelease]
     name: createrelease
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install latest nightly
         uses: dtolnay/rust-toolchain@stable
       - uses: actions/download-artifact@v4

.github/workflows/update-spec-for-repos.yml

@@ -26,9 +26,9 @@ jobs:
           app-id: ${{ secrets.GH_ORG_APP_ID }}
           private-key: ${{ secrets.GH_ORG_APP_PRIVATE_KEY }}
           owner: ${{ github.repository_owner }}
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       # Checkout the repo since we will want to update the file there.
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           repository: 'kittycad/${{ matrix.repo }}'
           path: ${{ matrix.repo }}

.github/workflows/validate-openapi-spec.yml

@@ -16,7 +16,7 @@ jobs:
   format:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v4.1.0
         with:
           node-version: '18'