vim: Import v8.2.2453

* 8.2.2453: Vim9: a variable name with "->" in the next line doesn't work
* 8.2.2452: no completion for the 'filetype' option

gitlog.txt

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-* [8.2.2451](https://github.com/vim/vim/commit/e7bebc495d4014d7bc81f863939c35268cb8e97d): MS-Windows: Extended Attributes not preserved\n* [8.2.2450](https://github.com/vim/vim/commit/7781ebe50f6d4daba02be3bd7e6ca08cd459674b): MS-Windows: ADS was not preserved if 'backupcopy' is "yes"\n* [8.2.2449](https://github.com/vim/vim/commit/3b690069730805a147d45d92eaca4dc838272d1d): Vim9: flatten() always changes the list type\n* [8.2.2448](https://github.com/vim/vim/commit/9d20daffc296b9eb901fb14bdd83620ea55d440a): compilation error with Ruby 3.0\n* [8.2.2447](https://github.com/vim/vim/commit/f9547eb6ef02e305203b859d2dcfdae930b9d544): 'foldlevel' not applied to folds restored from session\n* [8.2.2446](https://github.com/vim/vim/commit/5daa91162699e4f8b54f9d1caaaab2715038941c): setting 'term' empty has different error if compiled with GUI
+* [8.2.2453](https://github.com/vim/vim/commit/148be9bc1cca16ce47ad21563f5835682001f9a2): Vim9: a variable name with "->" in the next line doesn't work\n* [8.2.2452](https://github.com/vim/vim/commit/d5e8c92816f35ea1a9298084238a08f35958baa6): no completion for the 'filetype' option