fix ci

.github/workflows/pika.yml

@@ -156,7 +156,7 @@ jobs:
           sh integrate_test.sh
 
   build_on_macos:
-    runs-on: macos-latest
+    runs-on: macos-11
 
     steps:
       - uses: actions/checkout@v4
@@ -169,12 +169,12 @@ jobs:
       - name: ccache
         uses: hendrikmuhs/[email protected]
         with:
-          key: macos-latest
+          key: macos-11
 
       - name: Install Deps
         run: |
           brew update
-          brew install --overwrite [email protected] autoconf protobuf llvm wget git
+          brew install --overwrite autoconf protobuf llvm
           brew install gcc@10 automake cmake make binutils
 
       - name: Configure CMake