CI: compliance: fix check_compliance workflow

Use older junitparser, new version is not compatible.
This patch is inspired from Zephyr project, proposed by Anas Nashif:
zephyrproject-rtos/zephyr#31276

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>

.github/workflows/compliance.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Install python dependencies
       run: |
         pip3 install setuptools
-        pip3 install junitparser gitlint
+        pip3 install junitparser==1.6.3 gitlint
     - uses: actions/checkout@v1
     - name: Run Compliance Tests
       id: compliance