clean up action checkout for sbumodules

.github/workflows/build.yml

@@ -46,11 +46,8 @@ jobs:
       uses: actions/checkout@v2
     
     - name: Checkout Submodules
-      shell: bash
       run: |
-        #auth_header="$(git config --local --get http.https://github.com/.extraheader)"
         git submodule sync --recursive
-        #git -c "http.extraheader=$auth_header" -c protocol.version=2 submodule update --init --force --recursive
         git submodule update --init --recursive
     
     - name: Build

.gitmodules

@@ -31,7 +31,6 @@
 [submodule "lib/CMSIS_5"]
 	path = lib/CMSIS_5
 	url = https://github.com/ARM-software/CMSIS_5.git
-	branch = master
 [submodule "lib/CMSIS_4"]
 	path = lib/CMSIS_4
 	url = https://github.com/ARM-software/CMSIS.git