Bump actions/download-artifact from 6 to 7

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 6 to 7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v6...v7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/pnnx.yml

@@ -343,7 +343,7 @@ jobs:
             -Dprotobuf_DIR=$GITHUB_WORKSPACE/onnxruntime-${{ env.ONNXRUNTIME_VERSION }}-install/lib/cmake/protobuf ..
 
     - name: download-pnnx
-      uses: actions/download-artifact@v6
+      uses: actions/download-artifact@v7
       with:
         name: pnnx
         path: tools/pnnx/build/src

.github/workflows/release-python.yml

@@ -288,7 +288,7 @@ jobs:
       with:
         python-version: '3.x'
 
-    - uses: actions/download-artifact@v6
+    - uses: actions/download-artifact@v7
       with:
         path: dist
         merge-multiple: true

.github/workflows/release.yml

@@ -196,7 +196,7 @@ jobs:
       with:
         submodules: true
     - name: download-openmp-macos
-      uses: actions/download-artifact@v6
+      uses: actions/download-artifact@v7
       with:
         name: openmp-macos
         path: openmp-macos
@@ -368,7 +368,7 @@ jobs:
       with:
         submodules: true
     - name: download-openmp-ios
-      uses: actions/download-artifact@v6
+      uses: actions/download-artifact@v7
       with:
         name: openmp-ios
         path: openmp-ios
@@ -541,7 +541,7 @@ jobs:
       with:
         submodules: true
     - name: download-openmp-ios-simulator
-      uses: actions/download-artifact@v6
+      uses: actions/download-artifact@v7
       with:
         name: openmp-ios-simulator
         path: openmp-ios-simulator
@@ -730,7 +730,7 @@ jobs:
       with:
         submodules: true
     - name: download-openmp-mac-catalyst
-      uses: actions/download-artifact@v6
+      uses: actions/download-artifact@v7
       with:
         name: openmp-mac-catalyst
         path: openmp-mac-catalyst
@@ -911,7 +911,7 @@ jobs:
     steps:
     - uses: actions/checkout@v6
     - name: download-openmp-watchos
-      uses: actions/download-artifact@v6
+      uses: actions/download-artifact@v7
       with:
         name: openmp-watchos
         path: openmp-watchos
@@ -1060,7 +1060,7 @@ jobs:
     steps:
     - uses: actions/checkout@v6
     - name: download-openmp-watchos-simulator
-      uses: actions/download-artifact@v6
+      uses: actions/download-artifact@v7
       with:
         name: openmp-watchos-simulator
         path: openmp-watchos-simulator
@@ -1217,7 +1217,7 @@ jobs:
       with:
         submodules: true
     - name: download-openmp-tvos
-      uses: actions/download-artifact@v6
+      uses: actions/download-artifact@v7
       with:
         name: openmp-tvos
         path: openmp-tvos
@@ -1406,7 +1406,7 @@ jobs:
       with:
         submodules: true
     - name: download-openmp-tvos-simulator
-      uses: actions/download-artifact@v6
+      uses: actions/download-artifact@v7
       with:
         name: openmp-tvos-simulator
         path: openmp-tvos-simulator
@@ -1584,7 +1584,7 @@ jobs:
       with:
         submodules: true
     - name: download-openmp-visionos
-      uses: actions/download-artifact@v6
+      uses: actions/download-artifact@v7
       with:
         name: openmp-visionos
         path: openmp-visionos
@@ -1757,7 +1757,7 @@ jobs:
       with:
         submodules: true
     - name: download-openmp-visionos-simulator
-      uses: actions/download-artifact@v6
+      uses: actions/download-artifact@v7
       with:
         name: openmp-visionos-simulator
         path: openmp-visionos-simulator
@@ -2118,7 +2118,7 @@ jobs:
     steps:
     - run: sudo xcode-select --switch /Applications/Xcode_16.4.0.app
     - name: download
-      uses: actions/download-artifact@v6
+      uses: actions/download-artifact@v7
       with:
         path: artifacts
 
@@ -2256,7 +2256,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: download
-      uses: actions/download-artifact@v6
+      uses: actions/download-artifact@v7
       with:
         path: artifacts