Bump GH actions versions to solve warnings

.github/workflows/llvm.yml

@@ -22,7 +22,7 @@ jobs:
       ACTIONS_ALLOW_UNSECURE_COMMANDS: true
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: lukka/get-cmake@latest
 
       - name: Clone LLVM

.github/workflows/main.yml

@@ -24,7 +24,7 @@ jobs:
       DOTNET_CLI_TELEMETRY_OPTOUT: true
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: '0'
 
@@ -63,7 +63,7 @@ jobs:
         shell: bash
         run: build/build.sh prepack -platform $PLATFORM
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           name: intermediate
           path: |
@@ -82,7 +82,7 @@ jobs:
       DOTNET_CLI_TELEMETRY_OPTOUT: true
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: '0'
 
@@ -102,7 +102,7 @@ jobs:
         run: build/build.sh pack
 
       - name: Upload package
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: CppSharp.nupkg
           path: |