Release 1.9.18.2

Fix build on Ubuntu 22.04

What's Changed

• cmake-modules/BuildGSL.cmake: unbreak GSL download by @bcdarwin in #135
• Fix MANPATH so that system man pages still work. by @gdevenyi in #144
• fix zlib download url and hash due to deprecation by @bcdarwin in #146
• Fixes for 22.04 build by @gdevenyi in #154

New Contributors

• @bcdarwin made their first contribution in #135

Full Changelog: release-1.9.18.1...release-1.9.18.2