chore(gha): bump mikefarah/yq from 4.42.1 to 4 (#277)

Use the generic v4 tag to limit the maintenance.

Author: dependabot[bot]

.github/workflows/update-bpmn-visualization-version.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Get the old version of bpmn-visualization
         id: lookupOldBPMNVisuVersion
-        uses: mikefarah/yq@v4.42.1
+        uses: mikefarah/yq@v4
         with:
           cmd: yq '.dependencies[] | select(.name == "bpmn-visualization") | .version' inst/htmlwidgets/bpmnVisualizationR.yaml
       - run: echo "OLD_VERSION=${{ steps.lookupOldBPMNVisuVersion.outputs.result }}" >> $GITHUB_ENV