Update ghcr.yml

Author: lmangani

.github/workflows/ghcr.yml

@@ -24,7 +24,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v3
       with:
-        go-version: 1.20
+        go-version: 1.18
 
     - name: Libraries
       run: sudo apt-get install -y libpcap-dev libluajit-5.1-dev