ci: Upgrade import-codesign-certs action

Use the fork again until the upstream starts merging pull requests. It
is out of date with its forks. The main motivation for this change is to
get off the now deprecated Node v16.

.github/workflows/build.yml

@@ -100,7 +100,9 @@ jobs:
           path: publish
 
       - name: Add Cert to Keychain
-        uses: apple-actions/import-codesign-certs@v2
+        # todo: Switch back to upstream when this is merged:
+        # https://github.com/Apple-Actions/import-codesign-certs/pull/58
+        uses: recyclarr/import-codesign-certs@master
         with:
           p12-file-base64: ${{ secrets.MAC_CERT_BASE64 }}
           p12-password: ${{ secrets.MAC_CERT_PASSWORD }}