ci: bump GitHub actions to Node.js 24 runtime

Bumps actions/checkout v4→v6, actions/cache v4→v5,
actions/upload-artifact v4→v7, actions/download-artifact v4→v8
to silence the Node.js 20 deprecation warnings GitHub is emitting
ahead of the June 2026 cutoff.

softprops/action-gh-release stays on v2 (third-party, wasn't in the
deprecation list and v3 would need a separate compatibility review).

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Mark workspace safe
@@ -66,7 +66,7 @@ jobs:
       KDIR: /opt/ddk/kdir/${{ matrix.kmi }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Build kernel module
         run: |
@@ -90,7 +90,7 @@ jobs:
           (cd kmod/module && zip -qr "$GITHUB_WORKSPACE/vpnhide-kmod-${{ matrix.kmi }}.zip" .)
 
       - name: Upload artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: vpnhide-kmod-${{ matrix.kmi }}
           path: vpnhide-kmod-${{ matrix.kmi }}.zip
@@ -105,7 +105,7 @@ jobs:
         password: ${{ secrets.GITHUB_TOKEN }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
 
@@ -113,7 +113,7 @@ jobs:
         run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
 
       - name: Cache cargo
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             /usr/local/cargo/registry
@@ -129,7 +129,7 @@ jobs:
           ./build-zip.sh
 
       - name: Upload artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: vpnhide-zygisk
           path: zygisk/target/vpnhide-zygisk.zip
@@ -143,7 +143,7 @@ jobs:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Mark workspace safe
         run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
@@ -168,7 +168,7 @@ jobs:
           cp app/build/outputs/apk/release/app-release.apk "$GITHUB_WORKSPACE/vpnhide.apk"
 
       - name: Upload artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: vpnhide
           path: vpnhide.apk
@@ -177,7 +177,7 @@ jobs:
   portshide:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Package ports module zip
         run: |
@@ -188,7 +188,7 @@ jobs:
           mv vpnhide-ports.zip "$GITHUB_WORKSPACE/vpnhide-ports.zip"
 
       - name: Upload artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: vpnhide-ports
           path: vpnhide-ports.zip
@@ -200,7 +200,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Download all artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           path: dist/
           merge-multiple: true