actions: update upload-artifact to v4

Author: cejkato2

.github/workflows/packages.yml

@@ -29,7 +29,7 @@ jobs:
       run: cd "$GITHUB_WORKSPACE"/../turris-build/build/; make package/nemea-modules/compile -j$(nproc)
     - name: Collect artifacts
       run: mkdir /tmp/mox-cesnet; cp "$GITHUB_WORKSPACE/../turris-build/build/bin/packages/aarch64_cortex-a53/cesnet"/* /tmp/mox-cesnet/ 
-    - uses: actions/upload-artifact@v2
+    - uses: actions/upload-artifact@v4
       with:
         name: turris-mox-packages
         path: /tmp/mox-cesnet/
@@ -54,7 +54,7 @@ jobs:
       run: cd "$GITHUB_WORKSPACE"/../openwrt-sdk-*-generic_gcc-*_musl.Linux-x86_64; make defconfig; make package/luci-app-ipfixprobe/compile -j$(nproc)
     - name: Collect artifacts
       run: mkdir /tmp/tplink-cesnet; cp "$GITHUB_WORKSPACE"/../openwrt-sdk-*-generic_gcc-*_musl.Linux-x86_64/bin/packages/mips_24kc/cesnet/* /tmp/tplink-cesnet/
-    - uses: actions/upload-artifact@v2
+    - uses: actions/upload-artifact@v4
       with:
         name: tplink-packages
         path: /tmp/tplink-cesnet/