.github: workflows: bsim-tests: install python packages

A bit confused as to how this worked before, maybe the docker image had
pykwalify pre-installed or something, but we do need python dependencies
properly installed to run CI - here this commit is specifically fixing
an issue with jsonschema not being found.

Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>

Author: kartben

.github/workflows/bsim-tests.yaml

@@ -97,6 +97,10 @@ jobs:
 
           echo "ZEPHYR_SDK_INSTALL_DIR=/opt/toolchains/zephyr-sdk-$( cat SDK_VERSION )" >> $GITHUB_ENV
 
+      - name: Install Python packages
+        run: |
+          pip install -r scripts/requirements-actions.txt --require-hashes
+
       - name: Check common triggering files
         uses: tj-actions/changed-files@ed68ef82c095e0d48ec87eccea555d944a631a4c # v46.0.5
         id: check-common-files