OSGeo/grass: GRASS GIS 7.8.7RC1

This is an update release of the GRASS GIS 7.8 series. Download source code tarball at https://grass.osgeo.org/grass78/source/grass-7.8.7RC1.tar.gz https://grass.osgeo.org/grass78/source/grass-7.8.7RC1.md5sum For further release details (bug fixes and enhancements), see https://trac.osgeo.org/grass/wiki/Grass7/NewFeatures78 The GRASS GIS 7.8.7 release provides more than 40 fixes and improvements with respect to the release 7.8.6. What's Changed Modules: tgis db version mismatch: promote t.downgrade by @landam in https://github.com/OSGeo/grass/pull/2002 Unit tests/CI: grass.gunittest: Use collections.abc for Iterable (#2006) by @wenzeslaus in https://github.com/OSGeo/grass/pull/2008 CI: Remove Ubuntu 16.04 from GH Actions for 7.8 branch by @wenzeslaus in https://github.com/OSGeo/grass/pull/2009 GRASS GIS addons management: tools/mkhtml.py: fix module/official addons source code and history URL branch by @tmszi in https://github.com/OSGeo/grass/pull/2038 tools/mkhtml.py: replace f-string with format() function to maintain compatibility with Python 3.5/2.7 version by @tmszi in https://github.com/OSGeo/grass/pull/2077 tools/mkhtml.py: fix git cherry-pick commit cba6a7aebf339d9c5fa822bf890d7cc759b07e18 by @tmszi in https://github.com/OSGeo/grass/pull/2110 wxGUI: remove .setpdfwrite option on MS Windows by @ninsbl in https://github.com/OSGeo/grass/pull/1962 wxGUI: no is_shell_running available by @neteler in https://github.com/OSGeo/grass/pull/2056 Translations i18n: Update for release branch 7.8 by @HuidaeCho in https://github.com/OSGeo/grass/pull/2104 Full Changelog: https://github.com/OSGeo/grass/compare/7.8.6...7.8.7RC