Change sdist filename to all lowercase

It seems this is now a requirement from PyPI.  :(

.github/workflows/build-linux-wheels.yml

@@ -52,7 +52,7 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: wxPython-source
-          path: dist/wxPython-${{ steps.generate.outputs.version }}.tar.gz
+          path: dist/wxpython-${{ steps.generate.outputs.version }}.tar.gz
 
   build-wheels:
     # wait for prior job to complete

.github/workflows/ci-build.yml

@@ -82,7 +82,7 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: wxPython-source
-          path: dist/wxPython-${{ steps.generate.outputs.version }}.tar.gz
+          path: dist/wxpython-${{ steps.generate.outputs.version }}.tar.gz
 
       - name: Create demo source distribution (sdist_demo)
         if: github.event_name == 'push'
@@ -243,10 +243,10 @@ jobs:
         run: |
           if [ -z "$CIBW_BUILD" ]; then
               cd dist
-              pip wheel -v wxPython-${{ env.VERSION }}.tar.gz
+              pip wheel -v wxpython-${{ env.VERSION }}.tar.gz
           else
               pip install cibuildwheel
-              cibuildwheel dist/wxPython-${{ env.VERSION }}.tar.gz --output-dir dist
+              cibuildwheel dist/wxpython-${{ env.VERSION }}.tar.gz --output-dir dist
           fi
 
       - name: Simple smoke test

build.py

@@ -2271,7 +2271,7 @@ def cmd_sdist(options, args):
 
     # build the tarball
     msg('Archiving Phoenix source...')
-    rootname = "%s-%s" % (baseName, cfg.VERSION)
+    rootname = "%s-%s" % (baseName.lower(), cfg.VERSION)
     tarfilename = posixjoin(phoenixDir(), 'dist', '%s.tar.gz' % rootname)
     if os.path.exists(tarfilename):
         os.remove(tarfilename)