try and fix the docs publishing

Author: nplasterer

.github/workflows/docs.yml

@@ -3,14 +3,20 @@ on:
   push:
     branches:
       - main
+      - np/fixes-docs
 permissions:
   contents: write
 jobs:
   publish-docs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'adopt'
+          java-version: '17'
       - name: Build documentation
         run: ./gradlew dokkaHtml
       - name: Publish documentation