Update github actions to resolve most node deprecation warnings

As is github tradition, workflows started yelling about running on a
node version that was getting sunset, so here we go again.

Relevant bumps:

- https://github.com/actions/checkout/releases/tag/v4.0.0
- https://github.com/actions/setup-dotnet/releases/tag/v4.0.0
- https://github.com/actions/cache/releases/tag/v4.0.0
- https://github.com/actions/setup-java/releases/tag/v4.0.0
- https://github.com/peter-evans/create-pull-request/releases/tag/v6.0.0
- https://github.com/dorny/test-reporter/releases/tag/v1.8.0

Notably, `actions/upload-artifact` is _not_ bumped to v4, although it
should be to resolve the node deprecation warnings, because it has more
breaking changes and bumping would break `dorny/test-reporter`
(see https://github.com/dorny/test-reporter/issues/363).

.github/workflows/update-web-mod-definitions.yml

@@ -13,23 +13,23 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Install .NET 8.0.x
-      uses: actions/setup-dotnet@v3
+      uses: actions/setup-dotnet@v4
       with:
         dotnet-version: "8.0.x"
 
     - name: Checkout ppy/osu
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         path: osu
 
     - name: Checkout ppy/osu-tools
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         repository: ppy/osu-tools
         path: osu-tools
 
     - name: Checkout ppy/osu-web
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         repository: ppy/osu-web
         path: osu-web
@@ -43,7 +43,7 @@ jobs:
       working-directory: ./osu-tools
 
     - name: Create pull request with changes
-      uses: peter-evans/create-pull-request@v5
+      uses: peter-evans/create-pull-request@v6
       with:
         title: Update mod definitions
         body: "This PR has been auto-generated to update the mod definitions to match ppy/osu@${{ github.ref_name }}."