Update actions/checkout digest to 755da8c

Signed-off-by: Renovate Bot <bot@renovateapp.com>

.github/workflows/nightly.yml

@@ -16,7 +16,7 @@ jobs:
       HEDGEDOC_IMAGE: quay.io/hedgedoc/hedgedoc-nightly
     steps:
       - name: Checkout
-        uses: actions/checkout@7dd9e2a3dc350cf687eb1b2a4fadfee8c8e49675 # v3
+        uses: actions/checkout@755da8c3cf115ac066823e79a1e1788f8940201b # v3
 
       - name: Set date
         run: echo TODAY=$(date +%Y%m%d) >> $GITHUB_ENV

.github/workflows/release.yml

@@ -15,7 +15,7 @@ jobs:
       HEDGEDOC_IMAGE: quay.io/hedgedoc/hedgedoc
     steps:
       - name: Checkout
-        uses: actions/checkout@7dd9e2a3dc350cf687eb1b2a4fadfee8c8e49675 # v3
+        uses: actions/checkout@755da8c3cf115ac066823e79a1e1788f8940201b # v3
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@e81a89b1732b9c48d79cd809d8d81d79c4647a18 # tag=v2

.github/workflows/test.yml

@@ -14,7 +14,7 @@ jobs:
     env:
       BASE: ${{ matrix.base }} # needed in tests/version.sh
     steps:
-      - uses: actions/checkout@7dd9e2a3dc350cf687eb1b2a4fadfee8c8e49675 # v3
+      - uses: actions/checkout@755da8c3cf115ac066823e79a1e1788f8940201b # v3
       - name: Build ${{ matrix.base }} image
         run: docker build -f ${{ matrix.base }}/Dockerfile -t hedgedoc .
       - run: docker network create postgres