refactor: improve Go version extraction reliability in CI

refactor: improve Go version extraction reliability in CI

.github/workflows/update-version.yml

@@ -54,7 +54,21 @@ jobs:
           REPO="filecoin-project/lotus"
           LATEST_RELEASE=$(curl -s "https://api.github.com/repos/${REPO}/releases/latest" | jq -r .tag_name)
           GO_MOD_URL="https://raw.githubusercontent.com/${REPO}/${LATEST_RELEASE}/go.mod"
-          GO_VERSION=$(curl -s $GO_MOD_URL | grep -oP 'go \K[0-9]+\.[0-9]+(\.[0-9]+)?')
+          
+          # Download go.mod and check if successful
+          GO_MOD=$(curl -s $GO_MOD_URL)
+          if [ $? -ne 0 ]; then
+            echo "Error: Failed to download go.mod from $GO_MOD_URL"
+            exit 1
+          fi
+          
+          GO_VERSION=$(echo "$GO_MOD" | awk '/^go / {print $2; exit}')
+          if [ -z "$GO_VERSION" ]; then
+            echo "Error: Could not find Go version in go.mod"
+            exit 1
+          fi
+          
+          echo "Found Go version: $GO_VERSION"
           echo "current_go_version=$GO_VERSION" >> $GITHUB_OUTPUT
 
       - name: Update version.json