build(deps): bump actions/upload-artifact from 5 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/artifacts.yaml

@@ -39,7 +39,7 @@ jobs:
         run: cp LICENSE* dist
 
       - name: Upload binaries
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: rustls-ffi-x86_64-windows
           path: dist
@@ -70,7 +70,7 @@ jobs:
         run: cp LICENSE* dist
 
       - name: Upload binaries
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: rustls-ffi-x86_64-linux-gnu
           path: dist
@@ -97,7 +97,7 @@ jobs:
         run: ./debian/build.sh
 
       - name: Upload deb
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: librustls_0.15.0_amd64.deb
           path: librustls_0.15.0_amd64.deb
@@ -136,7 +136,7 @@ jobs:
         run: cp LICENSE* arm64-dist
 
       - name: Upload binaries (arm64)
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: rustls-ffi-arm64-macos
           path: arm64-dist
@@ -153,7 +153,7 @@ jobs:
         run: cp LICENSE* x86-dist
 
       - name: Upload binaries (x86_64)
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: rustls-ffi-x86_64-macos
           path: x86-dist