chore(gh): bump actions/checkout from 2 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](actions/checkout@v2...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/clone.yml

@@ -12,7 +12,7 @@ jobs:
       contents: write
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
 
       - name: gh login
         run: echo "${{ secrets.SECRET_TOKEN }}" | gh auth login --with-token

.github/workflows/docs.yml

@@ -11,7 +11,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
         with:
           fetch-depth: 0
       - name: Setup Python

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
         with:
           fetch-depth: 0
       - name: Check Version
@@ -134,7 +134,7 @@ jobs:
       pages: write
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
         with:
           ref: ${{ github.event.release.tag_name }}
           fetch-depth: 0
@@ -157,7 +157,7 @@ jobs:
       contents: read
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
         with:
           ref: ${{ github.event.release.tag_name }}
           fetch-depth: 0

.github/workflows/tests.yml

@@ -15,7 +15,7 @@ jobs:
     permissions:
         contents: read
     steps:
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
       - name: Run Basic Tests
         working-directory: ${{ github.workspace }}
         shell: pwsh