Update gradle, actions and fix typo in branch

.github/workflows/gradle.yml

@@ -3,23 +3,24 @@ name: Java CI
 on:
   push:
     branches:
-    - v4
-    - v5
-    - leagcy/1.8-1.12
+    - 'v4'
+    - 'v5'
+    - 'legacy/1.8-1.12'
   pull_request:
     branches:
-    - v4
-    - v5
-    - leagcy/1.8-1.12
+    - 'v4'
+    - 'v5'
+    - 'legacy/1.8-1.12'
  
 jobs:
   test:
     runs-on: ubuntu-18.04
 
     steps:
-    - uses: actions/checkout@v1
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
+    - name: Checkout
+      uses: actions/checkout@v2.0.0
+    - name: Setup Java JDK 1.8
+      uses: actions/setup-java@v1.3.0
       with:
         java-version: 1.8
     - name: Gradle Wrapper Validation