Upgrade Github Action versions

Author: japgolly

.github/workflows/ci.yml

@@ -21,10 +21,10 @@ jobs:
       SCALAJS_VERSION: "${{ matrix.scalajsversion == '0.6.x' && '0.6.28' || '' }}"
     steps:
       - uses: actions/checkout@v2
-      - uses: olafurpg/setup-scala@v10
+      - uses: olafurpg/setup-scala@v13
         with:
           java-version: "adopt@1.8"
-      - uses: coursier/cache-action@v5
+      - uses: coursier/cache-action@v6
       - name: Build
         run: sbt "++${{ matrix.scalaversion }}" package
       - name: Test generate documentation
@@ -37,9 +37,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: olafurpg/setup-scala@v10
+      - uses: olafurpg/setup-scala@v13
         with:
           java-version: "adopt@1.8"
-      - uses: coursier/cache-action@v5
+      - uses: coursier/cache-action@v6
       - name: Readme generation
         run: sbt readme/run

.github/workflows/ghpages.yml

@@ -11,10 +11,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: olafurpg/setup-scala@v10
+      - uses: olafurpg/setup-scala@v13
         with:
           java-version: "adopt@1.8"
-      - uses: coursier/cache-action@v5
+      - uses: coursier/cache-action@v6
 
       - name: Build
         run: sbt readme/run