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] <support@github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -48,7 +48,7 @@ jobs:
           test/Renci.SshNet.IntegrationTests/
 
     - name: Archive Coverlet Results
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
           name: Coverlet Results Linux
           path: coverlet
@@ -74,7 +74,7 @@ jobs:
       run: dotnet pack
 
     - name: Archive NuGet Package
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: NuGet Package
         path: src/Renci.SshNet/bin/Release/*.*nupkg
@@ -140,7 +140,7 @@ jobs:
           test\Renci.SshNet.IntegrationTests\
 
     - name: Archive Coverlet Results
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: Coverlet Results Windows .NET Framework
         path: coverlet
@@ -182,7 +182,7 @@ jobs:
           test\Renci.SshNet.IntegrationTests\
 
     - name: Archive Coverlet Results
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: Coverlet Results Windows .NET
         path: coverlet