chore(ci): bump actions/checkout from 4.3.1 to 6.0.3

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.3.1 to 6.0.3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@34e1148...df4cb1c)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -100,7 +100,7 @@ jobs:
         if: needs.changes.outputs.code != 'true'
         run: echo "docs-only PR — skipping build & test (matrix=${{ matrix.go-version }})"
 
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         if: needs.changes.outputs.code == 'true'
 
       - uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5.6.0
@@ -169,7 +169,7 @@ jobs:
       run:
         working-directory: npm
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
       - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: "22"

.github/workflows/npm-publish.yml

@@ -107,7 +107,7 @@ jobs:
       # named branch — letting an attacker who creates a branch matching
       # the tag substitute branch contents into the published tarball
       # while the gate still validates the legitimate release.
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           ref: refs/tags/${{ steps.version.outputs.TAG }}
       - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4

.github/workflows/release-publish.yml

@@ -71,7 +71,7 @@ jobs:
       # the build source while the release evidence still refers to the
       # legitimate tag. Forcing the tags namespace disambiguates.
       - name: Checkout
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           ref: refs/tags/${{ inputs.tag }}
           fetch-depth: 0