feat(wokwi-test): add pip caching to optimize workflow performance

Author: JakubAndrysek

.github/workflows/wokwi-test.yml

@@ -70,6 +70,14 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Cache pip
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+
       - name: Cache PlatformIO
         uses: actions/cache@v4
         with: