chore(deps): update official github actions to v7 (#393)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/jekyll-build.yml

@@ -88,7 +88,7 @@ jobs:
           fi
 
       - name: Checkout theme
-        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10  # v6.0.3
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0  # v7.0.0
         with:
           repository: LizardByte/LizardByte.github.io
           ref: ${{ github.repository == 'LizardByte/LizardByte.github.io' && github.ref || env.INPUT_THEME_REF }}
@@ -243,7 +243,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout gh-pages
-        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10  # v6.0.3
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0  # v7.0.0
         with:
           ref: ${{ env.INPUT_TARGET_BRANCH }}
           path: gh-pages