Use a more traditional branch switch and pull

Signed-off-by: Andrew Symington <simmers@intrinsic.ai>

Author: asymingt

.github/workflows/build-and-deploy-rcr-ui.yml

@@ -45,8 +45,8 @@ jobs:
 
     - name: Switch to latest gh-pages branch of the RCR
       run: |
-        git submodule foreach git fetch origin gh-pages
-        git submodule foreach git checkout origin/gh-pages 
+        git submodule foreach git checkout gh-pages
+        git submodule foreach git pull --force
   
     - name: Setup Bazel
       uses: bazel-contrib/setup-bazel@0.15.0