Style: Remove curly quote usage in environment variable

In our wheel build CI job configuration, there is an accidental use of
curly quotes where we wanted straight quotes.  This does not seem to
matter, but this patch cleans it up.

Signed-off-by: Patrick M. Niedzielski <pniedzielski@bloomberg.net>

Author: pniedzielski

.github/workflows/build_wheels.yml

@@ -23,7 +23,7 @@ jobs:
 
       - name: Build sdist
         env:
-          BLAZINGMQ_PYTHON_NO_PKGCONFIG: ’1’
+          BLAZINGMQ_PYTHON_NO_PKGCONFIG: '1'
         run: pipx run build --sdist
 
       - uses: actions/upload-artifact@v4