ci: add zig v8 version into the cache key

Author: krichprollsch

.github/actions/install/action.yml

@@ -47,7 +47,7 @@ runs:
         cache-name: cache-v8
       with:
         path: ${{ inputs.cache-dir }}/v8
-        key: libc_v8_${{ inputs.v8 }}_${{ inputs.os }}_${{ inputs.arch }}.a
+        key: libc_v8_${{ inputs.v8 }}_${{ inputs.os }}_${{ inputs.arch }}_{{ inputs.zig-v8 }}.a
 
     - if: ${{ steps.cache-v8.outputs.cache-hit != 'true' }}
       shell: bash