Slither Action workflow: Update version to 0.3.0 (#379)

update version with fix for `detected dubious ownership in repository` issue

Author: kumaryash90

.github/workflows/slither.yml

@@ -33,7 +33,7 @@ jobs:
           version: nightly
 
       - name: Run Slither
-        uses: crytic/slither-action@v0.2.0
+        uses: crytic/slither-action@v0.3.0
         continue-on-error: true
         id: slither
         with: