fix(ci): fix protobuf compiler installation error in dgraph test workflow (#2107)

Author: shivaji-kharse

.github/workflows/ci-dgraph-tests.yml

@@ -35,7 +35,7 @@ jobs:
         with:
           node-version: 16
       - name: Install protobuf-compiler
-        run: sudo apt-get install -y protobuf-compiler
+        run: sudo apt update && sudo apt install -y protobuf-compiler
       - name: Check protobuf
         run: |
           cd ./protos