chore: fix prerelease check error

Signed-off-by: Rory Z <[email protected]>

.github/workflows/release.yml

@@ -61,7 +61,7 @@ jobs:
       run: make build
     - id: prerelease
       run: |
-        if echo "${{ github.ref_name }}" |egrep -q "^[0-9].[0-9].[0-9]$"; then
+        if echo "${{ github.ref_name }}" |egrep -q "^[0-9]+.[0-9]+.[0-9]+$"; then
           echo "prerelease=false" >> $GITHUB_OUTPUT
         else
           echo "prerelease=true" >> $GITHUB_OUTPUT