fix formatting of codechecker parse output in step summary

Author: ardera

.github/workflows/static-analysis.yml

@@ -54,7 +54,7 @@ jobs:
         Please see the 'CodeChecker Bug Reports' artifact for more details:
         - ${{ steps.upload.outputs.artifact-url }}
 
-        `CodeChecker parse`:
+        **\`CodeChecker parse\`:**
         EOF
         
         echo '```' >>$GITHUB_STEP_SUMMARY