Bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/backport.yml

@@ -40,7 +40,7 @@ jobs:
           git config --global commit.gpgsign true
           git config --global tag.gpgsign true
       - name: Checkout repository
-        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           token: ${{ secrets.OPENVOXBOT_COMMIT_AND_PRS }}
       - name: Create backport pull requests

.github/workflows/gem_release.yaml

@@ -15,7 +15,7 @@ jobs:
     name: Build the gem
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - name: Install Ruby
         uses: ruby/setup-ruby@v1
         with:

.github/workflows/promote.yml

@@ -31,7 +31,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           ref: ${{ inputs.branch }}
           token: ${{ secrets.OPENVOXBOT_COMMIT_AND_PRS }}

.github/workflows/release.yml

@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           ref: ${{ inputs.base-branch }}
 

.github/workflows/tests.yaml

@@ -25,7 +25,7 @@ jobs:
     runs-on: ${{ matrix.cfg.os }}
     steps:
       - name: Checkout current PR
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Install ruby version ${{ matrix.cfg.ruby }}
         uses: ruby/setup-ruby@v1
@@ -58,7 +58,7 @@ jobs:
     runs-on: ${{ matrix.cfg.os }}
     steps:
       - name: Checkout current PR
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Install ruby version ${{ matrix.cfg.ruby }}
         uses: ruby/setup-ruby@v1
@@ -117,7 +117,7 @@ jobs:
     steps:
       # needs fetch-depth because the packaging dem reads old git tags
       - name: Checkout current PR
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           fetch-depth: 0
       - name: Install Ruby version 3.3