qt: fix patch checksum (#12024)

It seems that GitHub's output changed slightly for this patch (one more
letter for both short hashes on the index line), probably due to the
number of objects in the repository.

var/spack/repos/builtin/packages/qt/package.py

@@ -82,7 +82,7 @@ class Qt(Package):
 
     # Fix build failure with newer versions of GCC
     patch('https://github.com/qt/qtbase/commit/a52d7861edfb5956de38ba80015c4dd0b596259b.patch',
-          sha256='e10c871033568a9aed982628ed627356761f72f63c5fdaf11882dc147528e9ed',
+          sha256='c49b228c27e3ad46ec3af4bac0e9985af5b5b28760f238422d32e14f98e49b1e',
           working_dir='qtbase',
           when='@5.10:5.12.0 %gcc@9:')