mod: pin implementation to latest release version of zig

.gitea/workflows/release.yaml

@@ -17,7 +17,7 @@ jobs:
       - name: Setup zig installation
         uses: mlugg/setup-zig@v2
         with:
-          version: master
+          version: latest
       - name: Lint check
         run: zig fmt --check .
       - name: Spell checking

.gitea/workflows/test.yaml

@@ -16,7 +16,7 @@ jobs:
       - name: Setup zig installation
         uses: mlugg/setup-zig@v2
         with:
-          version: master
+          version: latest
       - name: Lint check
         run: zig fmt --check .
       - name: Spell checking