chore(deps): update actions/checkout action to v7

.github/workflows/aminet-upload.yml

@@ -39,7 +39,7 @@ jobs:
     name: Upload to Aminet
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Fetch artefacts from the named GitHub Release
         env:

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
     name: Host build (cc, strict warnings)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - name: make host
         run: make host
       - name: smoke-run host binaries
@@ -51,7 +51,7 @@ jobs:
     name: Amiga cross-build + Aminet archive
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       # Derive the image ref from the Makefile so the cache key tracks the
       # pinned digest automatically -- when `make refresh-codesets`-style
@@ -125,7 +125,7 @@ jobs:
     name: Semgrep (auto rules)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: actions/setup-python@v6
         with:
           python-version: '3.14'

.github/workflows/release.yml

@@ -32,7 +32,7 @@ jobs:
     name: Build archive + attach to GitHub Release
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           # Need history for auto-generated release notes between tags.
           fetch-depth: 0