Remove unneeded Github Actions step

Xcode will both use and create the cache during the build.

.github/actions/build-for-testing/action.yml

@@ -18,16 +18,6 @@ inputs:
 runs:
   using: composite
   steps:
-  - name: Resolve Swift Packages
-    shell: bash
-    working-directory: Apple
-    run: |
-      xcodebuild -resolvePackageDependencies \
-        -scheme '${{ inputs.scheme }}' \
-        -destination '${{ inputs.destination }}' \
-        -onlyUsePackageVersionsFromResolvedFile \
-        -clonedSourcePackagesDirPath SourcePackages \
-        -packageCachePath $PWD/PackageCache
   - name: Cache Swift Packages
     uses: actions/cache@v3
     with: