vim: Import v9.1.0981

* runtime(vim): update vim generator syntax script
* 9.1.0981: tests: typo in test_filetype.vim
* 9.1.0980: no support for base64 en-/decoding functions in Vim Script
* syntax(sh): Improve the recognition of bracket expressions
* runtime(doc): mention how NUL bytes are handled
* 9.1.0979: VMS: type warning with $XDG_VIMRC_FILE
* 9.1.0978: GUI tests sometimes fail when setting 'scroll' options
* 9.1.0977: filetype: msbuild filetypes are not recognized
* 9.1.0976: Vim9: missing return statement with throw
* 9.1.0975: Vim9: interpolated string expr not working in object methods
* 9.1.0974: typo in change of commit v9.1.0873

Author: github-actions[bot]

gitlog.txt

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-* [9.1.0973](https://github.com/vim/vim/commit/14ede1890f820d119ad521a4cfc2ef4beee5b4d3): too many strlen() calls in fileio.c\n* [runtime(sh): set shellcheck as the compiler for supported shells](https://github.com/vim/vim/commit/df67fc0e6994bc92f3d82edc6269e158875defad)\n* [runtime(doc): Fix enum example syntax](https://github.com/vim/vim/commit/49a35f67ebf3042b18fa4325b5c27ae25533afe5)\n* [9.1.0972](https://github.com/vim/vim/commit/5113831d16c05f3a8b47da0c6f95a641d5fc7b2e): filetype: TI linker map files are not recognized\n* [runtime(vim): Improve syntax script generator for Vim Script](https://github.com/vim/vim/commit/f0ab3e4e41964e2c4d10e29e98800aa0f7d33b05)\n* [9.1.0971](https://github.com/vim/vim/commit/3b3318b64043dcf29d6f06322739f695a5cc257e): filetype: SLNX files are not recognized\n* [9.1.0970](https://github.com/vim/vim/commit/7b12ac3ad86f02bf26d6830caa991041dd1c4785): VMS: build errors on VMS architecture\n* [runtime(doc): Fix documentation typos](https://github.com/vim/vim/commit/f2e08a1e54e1e6f594edac5cd971ac2e03896a07)
+* [runtime(vim): update vim generator syntax script](https://github.com/vim/vim/commit/f27e80a6e183a617dd885311871fd4eaa6075d16)\n* [9.1.0981](https://github.com/vim/vim/commit/2bee7e43e137bcef62e6872791e2be7ce9c32703): tests: typo in test\_filetype.vim\n* [9.1.0980](https://github.com/vim/vim/commit/810785c6890ef0a1cd2428410c8488cacfbac77b): no support for base64 en-/decoding functions in Vim Script\n* [syntax(sh): Improve the recognition of bracket expressions](https://github.com/vim/vim/commit/48fa3198b7118023fea4b15015a97c920887eb07)\n* [runtime(doc): mention how NUL bytes are handled](https://github.com/vim/vim/commit/6de7191c31941b8be46dcf81c0ab71ad1285ab66)\n* [9.1.0979](https://github.com/vim/vim/commit/80ed8b87614138a79bdd50c4b4199c0084601e04): VMS: type warning with $XDG\_VIMRC\_FILE\n* [9.1.0978](https://github.com/vim/vim/commit/2e1f757f7b52a00b77eb19648b7ea46e932eff2b): GUI tests sometimes fail when setting 'scroll' options\n* [9.1.0977](https://github.com/vim/vim/commit/32b7e3a8c99d369b02154df74cbe42a37c7c7e68): filetype: msbuild filetypes are not recognized\n* [9.1.0976](https://github.com/vim/vim/commit/ab9a8947d73c09981b966d3994f0a9298b8b5674): Vim9: missing return statement with throw\n* [9.1.0975](https://github.com/vim/vim/commit/b0206e9fb58c8a1c0e0b032f11ce056952182786): Vim9: interpolated string expr not working in object methods\n* [9.1.0974](https://github.com/vim/vim/commit/df4b3ca5dc26689d866c0a743ab835917f4cd6b7): typo in change of commit v9.1.0873