st-term: Update to 0.9.1

Changes:
0.9.1
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- Fix: bounds checks of dc.col.
- Fix: buffer overflow when handling long composed input.
- Ignore C1 control characters in UTF-8 mode.
- Improvements to cell handling and wide characters.
- Default config: decrease the default minlatency.
- Various other terminal fixes and compatibility improvements.

(leot)