.github/workflows/build_wamr_lldb.yml: use a bit more specific cache key

the current key looks like "x86_64-ubuntu-20.04-lldb_build".
it's a way too generic and can even hit the cache from the
previous releases.

this commit makes it contain the WAMR version number.

.github/workflows/build_wamr_lldb.yml

@@ -70,7 +70,7 @@ jobs:
             ./core/deps/llvm-project/build/share
             ./core/deps/llvm-project/lldb/tools/
             ./core/deps/llvm-project/wamr-lldb/
-          key: ${{inputs.arch}}-${{ inputs.runner }}-lldb_build
+          key: ${{ inputs.ver_num }}-${{ inputs.arch }}-${{ inputs.runner }}-lldb_build
 
       - name: setup xcode macos
         if: steps.lldb_build_cache.outputs.cache-hit != 'true' && contains(inputs.runner, 'macos')