Merged update from upstream sources

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Source: https://src.fedoraproject.org/rpms/gtkmm30.git#c06508883851282a9e6cca71564bc059dd746fdb

gtkmm30.spec

@@ -11,7 +11,7 @@
 
 Name:           gtkmm30
 Version:        3.24.3
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        C++ interface for the GTK+ library
 
 License:        LGPLv2+
@@ -102,6 +102,9 @@ cp -a demos/ _docs/
 
 
 %changelog
+* Tue Jan 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 3.24.3-2
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild
+
 * Mon Dec 14 2020 Kalev Lember <klember@redhat.com> - 3.24.3-1
 - Update to 3.24.3
 - Use https source URLs