ci: wait for the base branch's macOS deps instead of rebuilding them

.github/workflows/build_orca.yml

@@ -44,7 +44,7 @@ jobs:
         if: ${{ !(runner.os == 'macOS' && inputs.macos-combine-only) }}
         uses: actions/cache@v6
         with:
-          path: ${{ inputs.cache-path }}
+          path: ${{ github.workspace }}/${{ inputs.cache-path }}
           key: ${{ inputs.cache-key }}
           fail-on-cache-miss: true
 
@@ -460,7 +460,7 @@ jobs:
         # --tests builds the unit tests too; the unit_tests_windows_* jobs run them.
         run: |
           # cache-path is the install directory inside the deps build directory.
-          $deps = (Split-Path "${{ inputs.cache-path }}").Replace('\', '/')
+          $deps = (Split-Path "${{ github.workspace }}/${{ inputs.cache-path }}").Replace('\', '/')
           # -l compiles with Visual Studio's clang-cl and -x builds with Ninja; --msvc --msbuild is cl under the Visual Studio generator.
           $flags = if ("${{ inputs.compiler }}" -eq "clang") { "-l", "-x" } else { "--msvc", "--msbuild" }
           .\build_win.bat -s --tests -i --arch ${{ inputs.arch }} --build-dir $env:BUILD_DIR --deps-dir $deps @flags