Log Message:
libproxy: update to 0.5.2.

Link with libsocket where needed (#234) by @amigadave in #235
Remove libsoup from doc and CI by @janbrummer in #238
Fix coverity findings by @janbrummer in #241
Add a comment that docs option needs introspection by @janbrummer in #242
Set pac data after download only by @janbrummer in #244
Fix race condition in px_manager_get_proxies_sync by @janbrummer in #245
Update gobject dependency in pkgconfig file by @floppym in #239
Reread env variables in each get_config call by @janbrummer in #246
Bump version to 0.5.2 by @janbrummer in #247