upgrade github actions workflows to JDK 21 so roboelectric works on SDK 37

Author: sds100

.github/workflows/pull-request.yml

@@ -10,11 +10,11 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: set up JDK 17
-        uses: actions/setup-java@v3
+      - name: set up JDK 21
+        uses: actions/setup-java@v4
         with:
           distribution: 'oracle'
-          java-version: 17
+          java-version: 21
           cache: 'gradle'
 
       - name: Unit tests
@@ -36,11 +36,11 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-gradle-
 
-      - name: set up JDK 17
-        uses: actions/setup-java@v3
+      - name: set up JDK 21
+        uses: actions/setup-java@v4
         with:
           distribution: 'oracle'
-          java-version: 17
+          java-version: 21
           cache: 'gradle'
 
       - name: Ktlint check
@@ -101,11 +101,11 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-gradle-
 
-      - name: set up JDK 17
-        uses: actions/setup-java@v3
+      - name: set up JDK 21
+        uses: actions/setup-java@v4
         with:
           distribution: 'oracle'
-          java-version: 17
+          java-version: 21
           cache: 'gradle'
 
       - name: Setup Android SDK

.github/workflows/testing.yml

@@ -16,11 +16,11 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: set up JDK 17
-        uses: actions/setup-java@v3
+      - name: set up JDK 21
+        uses: actions/setup-java@v4
         with:
           distribution: 'oracle'
-          java-version: 17
+          java-version: 21
           cache: 'gradle'
 
       - name: Unit tests
@@ -42,11 +42,11 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-gradle-
 
-      - name: set up JDK 17
-        uses: actions/setup-java@v3
+      - name: set up JDK 21
+        uses: actions/setup-java@v4
         with:
           distribution: 'oracle'
-          java-version: 17
+          java-version: 21
           cache: 'gradle'
 
       - name: Ktlint check
@@ -113,11 +113,11 @@ jobs:
           property: VERSION_NUM
           value: ${{ github.run_number }}
 
-      - name: set up JDK 17
-        uses: actions/setup-java@v3
+      - name: set up JDK 21
+        uses: actions/setup-java@v4
         with:
           distribution: 'oracle'
-          java-version: 17
+          java-version: 21
           cache: 'gradle'
 
       - name: Setup Android SDK