ci: improve test workflow cache strategy

Author: tayne3

.github/workflows/test.yml

@@ -46,14 +46,18 @@ jobs:
         with:
           version: 0.15.2
 
+      - name: Get Zig version
+        id: zig-ver
+        run: echo "version=$(zig version)" >> $GITHUB_OUTPUT
+
       - name: Cache Zig dependencies
         uses: actions/cache@v4
         with:
           path: |
             ~/.cache/zig
             ~/AppData/Local/zig
             ~/Library/Caches/zig
-          key: ${{ runner.os }}-zig-deps-${{ hashFiles('.zigversion') }}
+          key: ${{ runner.os }}-zig-deps-${{ steps.zig-ver.outputs.version }}
           restore-keys: |
             ${{ runner.os }}-zig-deps-