Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](actions/checkout@v5...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/gh-pages.yml

@@ -20,7 +20,7 @@ jobs:
     if: ${{ github.repository == 'ruby/irb' && !startsWith(github.event_name, 'pull') }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Setup Ruby
         uses: ruby/setup-ruby@f26937343756480a8cb3ae1f623b9c8d89ed6984 # v1.196.0
         with:

.github/workflows/push_gem.yml

@@ -27,7 +27,7 @@ jobs:
         with:
           egress-policy: audit
 
-      - uses: actions/checkout@ff7abcd0c3c05ccf6adc123a8cd1fd4fb30fb493 # v4.2.2
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v4.2.2
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@13e7a03dc3ac6c3798f4570bfead2aed4d96abfb # v1.244.0

.github/workflows/test.yml

@@ -17,7 +17,7 @@ jobs:
     if: github.repository == 'ruby/irb' || github.event_name != 'schedule'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
@@ -38,7 +38,7 @@ jobs:
       WITH_LATEST_RELINE: ${{matrix.with_latest_reline}}
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@ff7abcd0c3c05ccf6adc123a8cd1fd4fb30fb493
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
@@ -56,7 +56,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
@@ -89,7 +89,7 @@ jobs:
       WITH_VTERM: 1
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@ff7abcd0c3c05ccf6adc123a8cd1fd4fb30fb493
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd
       - name: Install libvterm
         run: |
           sudo apt install -y libtool-bin

.github/workflows/truffle-ruby-test.yml

@@ -19,7 +19,7 @@ jobs:
       WITH_LATEST_RELINE: ${{matrix.with_latest_reline}}
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@ff7abcd0c3c05ccf6adc123a8cd1fd4fb30fb493
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with: