Added another prefix path

Author: liuzicheng1987

.github/workflows/macos-cxx20-vcpkg.yaml

@@ -67,7 +67,7 @@ jobs:
             export CMAKE_GENERATOR=Ninja
           fi
           $CXX --version
-          cmake -S . -B build -G Ninja -DCMAKE_CXX_STANDARD=20 -DCMAKE_BUILD_TYPE=Release -DSQLGEN_BUILD_TESTS=ON -DSQLGEN_DUCKDB=ON -DSQLGEN_POSTGRES=OFF -DSQLGEN_SQLITE3=OFF 
+          cmake -S . -B build -G Ninja -DCMAKE_CXX_STANDARD=20 -DCMAKE_BUILD_TYPE=Release -DSQLGEN_BUILD_TESTS=ON -DSQLGEN_DUCKDB=ON -DSQLGEN_POSTGRES=OFF -DSQLGEN_SQLITE3=OFF -DCMAKE_PREFIX_PATH=/opt/homebrew/opt/icu4c 
           cmake --build build -j 4
       - name: Compile
         if: matrix.db == 'postgres'