Bump required glib

This will allow us to use g_list_store_find unconditionally, see https://source.puri.sm/Librem5/calls/-/blob/master/src/util.c#L171)

The following discussion from !301 (merged) should be addressed:

• @guido.gunther started a discussion: (+3 comments)

  wouldn't you want to rather bump the glib requirement at some point?

When bumping to > 2.62 I got a few deprecation warnings like this /usr/include/evolution-data-server/libedataserver/e-flag.h:54:8: warning: ‘GTimeVal’ is deprecated: Use 'GDateTime' instead [-Wdeprecated-declarations.

Need to investigate.