Bump actions/upload-artifact from 3 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

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

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

.github/workflows/gendocs.yml

@@ -48,7 +48,7 @@ jobs:
 
     - name: 'Upload Artifacts'
       if: matrix.RELEASE
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: Documents
         path: |

.github/workflows/macos.yml

@@ -100,7 +100,7 @@ jobs:
         ./tools/uploadtool/upload_github.sh gui/GPSBabel-*.dmg
 
     - name: 'Upload Artifacts'
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: MacOS_Installer ${{ join(matrix.*) }}
         path: gui/GPSBabel-*.dmg

.github/workflows/ubuntu.yml

@@ -113,7 +113,7 @@ jobs:
         ./tools/uploadtool/upload_github.sh ${{ steps.build-snap.outputs.snap }}
 
     - name: Upload Artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: ${{ steps.build-snap.outputs.snap }}
         path: ${{ steps.build-snap.outputs.snap }}

.github/workflows/windows.yml

@@ -126,7 +126,7 @@ jobs:
         ./tools/uploadtool/upload_github.sh bld/gui/GPSBabel-*-Setup.exe
 
     - name: 'Upload Artifacts'
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: Windows_Installer ${{ join(matrix.*) }}
         path: |