Use merged version of some actions

Author: Skptak

.github/workflows/ci.yml

@@ -68,7 +68,7 @@ jobs:
           echo -e "${{ env.bashPass }} ${{ env.stepName }} ${{ env.bashEnd }}"
 
       - name: Check Coverage
-        uses: FreeRTOS/CI-CD-Github-Actions/coverage-cop@v2
+        uses: FreeRTOS/CI-CD-Github-Actions/coverage-cop@main
         with:
           coverage-file: ./test/unit-test/build/coverage.info
 
@@ -96,7 +96,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Run doxygen build
-        uses: FreeRTOS/CI-CD-Github-Actions/doxygen@v2
+        uses: FreeRTOS/CI-CD-Github-Actions/doxygen@main
         with:
           path: ./
 
@@ -324,7 +324,7 @@ jobs:
         run: git submodule update --checkout --init --recursive
 
       - name: Run manifest verifier
-        uses: FreeRTOS/CI-CD-GitHub-Actions/manifest-verifier@v2
+        uses: FreeRTOS/CI-CD-GitHub-Actions/manifest-verifier@main
         with:
           path: ./
           fail-on-incorrect-version: true