fix(ci): changes Coraza reference to main brach (envoyproxy#202)

Author: M4tteoP

.github/workflows/nightly-coraza-check.yaml

@@ -49,7 +49,7 @@ jobs:
 
       - name: Get last commit of coraza
         id: coraza-latest-commit
-        run: echo "value=$(gh api repos/corazawaf/coraza/commits/v3/dev -q .sha)" >> $GITHUB_OUTPUT
+        run: echo "value=$(gh api repos/corazawaf/coraza/commits/main -q .sha)" >> $GITHUB_OUTPUT
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}