Update upload action as previous v4 was deprecated.

Author: nyamatongwe

.github/workflows/build-check-macos.yml

@@ -21,7 +21,7 @@ jobs:
           run: (cd test/unit && make DEBUG=1 CXX=${{matrix.cpp_compiler}} --jobs=$(getconf _NPROCESSORS_ONLN) test)
         - name: Build Lexilla
           run: (cd src && make DEBUG=1 CXX=${{matrix.cpp_compiler}} --jobs=$(getconf _NPROCESSORS_ONLN))
-        - uses: actions/upload-artifact@v4
+        - uses: actions/upload-artifact@v6
           with:
               name: liblexilla.dylib
               path: bin/liblexilla.dylib

.github/workflows/build-check-win32.yml

@@ -39,7 +39,7 @@ jobs:
               cd src
               nmake -f lexilla.mak DEBUG=1
               cd ..
-        - uses: actions/upload-artifact@v4
+        - uses: actions/upload-artifact@v6
           with:
               name: lexilla${{ matrix.arch == 'amd64_arm64' && '-arm64' || '' }}.dll
               path: bin/lexilla.dll

.github/workflows/build-check.yml

@@ -21,7 +21,7 @@ jobs:
           run: (cd test/unit && make DEBUG=1 CXX=${{matrix.cpp_compiler}} --jobs=$(getconf _NPROCESSORS_ONLN) test)
         - name: Build Lexilla
           run: (cd src && make DEBUG=1 CXX=${{matrix.cpp_compiler}} --jobs=$(getconf _NPROCESSORS_ONLN))
-        - uses: actions/upload-artifact@v4
+        - uses: actions/upload-artifact@v6
           with:
               name: liblexilla-${{matrix.cpp_compiler}}.so
               path: bin/liblexilla.so