try fix CI

Author: serges147

.github/workflows/sonar.yml

@@ -23,7 +23,7 @@ jobs:
       - name: get nunavut
         run: |
           python3 -m venv .venv
-          source .venv/bin/activate
+          . .venv/bin/activate
           pip install git+https://github.com/OpenCyphal/[email protected]
       - name: Install sonar-scanner and build-wrapper
         uses: SonarSource/sonarcloud-github-c-cpp@v2

.github/workflows/tests.yml

@@ -31,7 +31,7 @@ jobs:
         # TODO: setup a venv, cache, and distribute to the other jobs.
         run: |
           python3 -m venv .venv
-          source .venv/bin/activate
+          . .venv/bin/activate
           pip install git+https://github.com/OpenCyphal/[email protected]
       - name: configure
         run: >
@@ -73,7 +73,7 @@ jobs:
     - name: get nunavut
       run: |
         python3 -m venv .venv
-        source .venv/bin/activate
+        . .venv/bin/activate
         pip install git+https://github.com/OpenCyphal/[email protected]
     - name: run tests
       env:
@@ -120,7 +120,7 @@ jobs:
     - name: get nunavut
       run: |
         python3 -m venv .venv
-        source .venv/bin/activate
+        . .venv/bin/activate
         pip install git+https://github.com/OpenCyphal/[email protected]
     - name: doc-gen
       run: >