ci: add merge conflict action and update action version

.github/workflows/build-release.yml

@@ -14,7 +14,7 @@ jobs:
 
     # Checkout the repository
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 0
 

.github/workflows/build-staging.yml

@@ -14,7 +14,7 @@ jobs:
 
     # Checkout the repository
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 0
 

.github/workflows/conflict-labeler.yml

@@ -0,0 +1,26 @@
+name: Merge Conflict Labeler
+
+on:
+  push:
+    branches:
+      - master
+  pull_request_target:
+    branches:
+      - master
+    types: [synchronize]
+
+jobs:
+  label:
+    name: Labeling
+    runs-on: ubuntu-latest
+    if: ${{ github.repository == 'openbullet/OpenBullet2' }}
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - name: Apply label
+        uses: eps1lon/actions-label-merge-conflict@v3
+        with:
+          dirtyLabel: 'merge-conflict'
+          commentOnDirty: 'This pull request has merge conflicts. Please resolve the conflicts so the PR can be successfully reviewed and merged.'
+          repoToken: '${{ secrets.GITHUB_TOKEN }}'

.github/workflows/unittests.yml

@@ -10,12 +10,12 @@ name: .NET
 
 jobs:
   test:
-    runs-on: windows-2019
+    runs-on: windows-2022
     steps:
-    - uses: actions/checkout@v2
-    - name: Setup .NET 6
-      uses: actions/setup-dotnet@v1
+    - uses: actions/checkout@v4
+    - name: Setup .NET 8
+      uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 6.0.x
+        dotnet-version: 8.0.x
     - name: Unittests
       run: dotnet test