IBus 1.5.28 is released

[Takao Fujiwara]

IBus 1.5.28 is released:
https://github.com/ibus/ibus/releases/tag/1.5.28

This is a bug fix release and thank you for the contributions.

- Implement new process_key_event for ibus-x11 506ac999
- Convert internal EN compose table to GResource 19ca1065 ae696351 bf8848eb
- Enhance surrounding text 8d0abbcb 781119be ddead515 2a235c8c
- Enhance CI 2719e936 2555fa97 a3a9bd30 f3a7772e
- Update ibusunicodegen.h with Unicode 15.0.0 8f00d67b
- Update simple.xml with xkeyboard-config 2.38-1 594ec48c 3c51582f
- Fix SEGVs cd621f8b ecfae167
- Release 1.5.28 bc065f8c

Code Contributors:
- tools: Check libdl for dlclose() properly in configure (Izumi
Tsutsui) babad783
- configure: Fix texts for surrounding text (Eberhard Beilharz) d190bc32
- Add active-surrounding-text property to IBusEngine (Philippe
Rouquier) bd24be45

Translation Contributors:
- po: Update translation (Georgian) (Temuri Doghonadze) 382c0349
- po: Update translation (Spanish) (Emilio Herrera) 8abf3ebd
- po: Update translation (Turkish) (Oğuz Ersen) f3a99839
- po: Update translation (Russian) (Alexey Rubtsov) 4b0e4c57
- po: Update translation (Korean) (김인수) 41e33c29
- po: Update translation (French) (Julien Humbert) 2f897b52
- po: Update translation (Italian) (Luis Pixeltux) f6eabce4