Bump actions/checkout from 6.0.0 to 6.0.2

Bumps [actions/checkout](https://github.com/actions/checkout) from 6.0.0 to 6.0.2.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](actions/checkout@v6...v6.0.2)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

.github/workflows/gemstash-ci.yml

@@ -58,7 +58,7 @@ jobs:
       GEMSTASH_SPEC_REDIS_SERVERS: redis://localhost:6379
       GEMSTASH_SPEC_MEMCACHED_SERVERS: localhost:11211
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v6.0.2
         with:
           persist-credentials: false
       - name: Setup ruby

.github/workflows/lint.yml

@@ -9,7 +9,7 @@ jobs:
     env:
       BUNDLE_WITH: "linting"
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v6.0.2
       with:
         persist-credentials: false
     - uses: ruby/setup-ruby@v1

.github/workflows/push_gem.yml

@@ -27,7 +27,7 @@ jobs:
         with:
           egress-policy: audit
 
-      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Install pandoc
         run: sudo apt-get install -y pandoc