fix: Update Github Actions to v4 and fix syntax

.github/workflows/build-mips.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Install Rust
       uses: dtolnay/rust-toolchain@stable
@@ -21,7 +21,7 @@ jobs:
         targets: mips-unknown-linux-musl
 
     - name: Install Trunk
-      uses: jetli/trunk-action@v0.4.0
+      uses: jetli/trunk-action@v0.5.0
       with:
         version: 'latest'
 
@@ -39,7 +39,7 @@ jobs:
         cross build --target mips-unknown-linux-musl --release
 
     - name: Upload Binary
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: vibetorrent-mips
         path: backend/target/mips-unknown-linux-musl/release/backend