vim: Import v9.1.1989

* 9.1.1989: Vim intro screen shows register message
* 9.1.1988: osc52 package can be further improved
* 9.1.1987: assert_equal() prepends unnecessary ':' when typed
* 9.1.1986: clipboard provider does not work when redirecting messages
* runtime(tutor): Improve Spanish translations
* 9.1.1985: tests: test_sound.vim fails on Windows

Author: github-actions[bot]

gitlog.txt

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-* [9.1.1984](https://github.com/vim/vim/commit/02b8ec7da52bb11e49d3e0d801eb0d349c73677e): terminal OSC52 support can be improved\n* [9.1.1983](https://github.com/vim/vim/commit/2019321e0be320183afa47b7ea979dc4fc3984a0): Vim9: class\_name definition can be improved\n* [9.1.1982](https://github.com/vim/vim/commit/eb5995a8764418359b979093f3af06f03ac7de6e): Use after free with redraw\_listener\_add()\n* [9.1.1981](https://github.com/vim/vim/commit/35de719c0c50d0d1a91badaadabc9bd5abb5ef42): tests: test suite may stop on error in gen\_opt\_test.vim\n* [CI: Bump actions/cache from 4 to 5](https://github.com/vim/vim/commit/e1ea10a0a1838dc856bce8fac0d3422940fcaed5)\n* [translation(sr): Update the Serbian translation](https://github.com/vim/vim/commit/6bfc468c9f9da842381c4dca59c2c467b4de9dde)
+* [9.1.1989](https://github.com/vim/vim/commit/ca12f62d0a6a49db0e1956c5c217e7e00e0366c7): Vim intro screen shows register message\n* [9.1.1988](https://github.com/vim/vim/commit/b9e45e82ba1d81f86183be1e8b7f004682fc3533): osc52 package can be further improved\n* [9.1.1987](https://github.com/vim/vim/commit/c4b3aefd0d5f81693e7098f224d3e4bfe24a7aa7): assert\_equal() prepends unnecessary ':' when typed\n* [9.1.1986](https://github.com/vim/vim/commit/beeea8a1ce91196eb2ca073a3942089119e06600): clipboard provider does not work when redirecting messages\n* [runtime(tutor): Improve Spanish translations](https://github.com/vim/vim/commit/bbf616a9d6c6749e5dc9f07db55640c4dc7b44ea)\n* [9.1.1985](https://github.com/vim/vim/commit/878d00bb3a415ba71593ee798f642120e5e17a74): tests: test\_sound.vim fails on Windows