chore: actions update, ready for immutable releases

Author: martinpaljak

.github/workflows/robot.yml

@@ -8,6 +8,7 @@ on:
   pull_request:
     branches:
       - master
+      - next
 
 permissions:
   contents: write
@@ -23,12 +24,12 @@ jobs:
     name: Java ${{ matrix.java }}
     steps:
       - name: Check out code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0 # To make git describe give the intended output
           fetch-tags: true
       - name: Setup java
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@v5
         with:
           java-version: ${{ matrix.java }}
           distribution: zulu
@@ -49,7 +50,7 @@ jobs:
       - name: Release
         if: startsWith(github.ref, 'refs/tags/v') && matrix.java == '17'
         id: create_release
-        uses: softprops/action-gh-release@v2.4.1
+        uses: softprops/action-gh-release@v2.5.0
         with:
           files: |
             tool/target/gp.jar