Update GitHub Actions to use upload-artifact@v4

Author: Rayrsn

.github/workflows/rust.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Run tests
       run: cargo test --verbose
     - name: Upload Release
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: Linux
         path: ./target/release/discord-rpc-cli
@@ -34,7 +34,7 @@ jobs:
     - name: Run tests
       run: cargo test --verbose
     - name: Upload Release
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: Windows
         path: ./target/release/discord-rpc-cli.exe
@@ -49,7 +49,7 @@ jobs:
     - name: Run tests
       run: cargo test --verbose
     - name: Upload Release
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: MacOS
         path: ./target/release/discord-rpc-cli