vim: Import v9.1.0663

* 9.1.0663: tests: zip test still resets 'shellslash' option
* runtime(zip): use defer to restore old settings
* runtime(zip): add a generic Message function
* runtime(zip): increment base version of zip plugin
* runtime(zip): raise minimum Vim version to v9.0
* runtime(zip): refactor save and restore of options
* runtime(zip): remove test for fnameescape
* runtime(zip): use :echomsg instead of :echo
* runtime(zip): clean up and remove comments
* 9.1.0662: filecopy() may return wrong value when readlink() fails

Author: github-actions[bot]

gitlog.txt

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-* [9.1.0661](https://github.com/vim/vim/commit/d7af21e746f3992c650caf6b76465880b96302b4): the zip plugin is not tested.\n* [runtime(zip): Fix for FreeBSD's unzip command](https://github.com/vim/vim/commit/f0e9b72c8fdd47b9b410a11edf7479953cb2aed9)\n* [runtime(doc): capitalize correctly](https://github.com/vim/vim/commit/217d3c17c6fa8d1223fa8dd39efd8c32897f9441)
+* [9.1.0663](https://github.com/vim/vim/commit/91efcd115e700725b9ebded0f5d7bc0d3fa98d9d): tests: zip test still resets 'shellslash' option\n* [runtime(zip): use defer to restore old settings](https://github.com/vim/vim/commit/afea6b946827e964271eb19579946a7f88d2f329)\n* [runtime(zip): add a generic Message function](https://github.com/vim/vim/commit/8d52926857ec7f08a9bee8f96470748cecf58002)\n* [runtime(zip): increment base version of zip plugin](https://github.com/vim/vim/commit/a336d8f21e4cce877e23d47db238801a5a406992)\n* [runtime(zip): raise minimum Vim version to v9.0](https://github.com/vim/vim/commit/e1044fb72edfc5d1a49d11e887521ce8900a99a5)\n* [runtime(zip): refactor save and restore of options](https://github.com/vim/vim/commit/19636be55e023cb726389107e9e7d62049b6fd58)\n* [runtime(zip): remove test for fnameescape](https://github.com/vim/vim/commit/33836d38b82aa926a2a2b3f945a0139f373f7e56)\n* [runtime(zip): use :echomsg instead of :echo](https://github.com/vim/vim/commit/120c0dd815fa3b44df0fa477f7f3313e4a69c652)\n* [runtime(zip): clean up and remove comments](https://github.com/vim/vim/commit/a63f66e953d811bb6d044e92fe338e533ad94ff5)\n* [9.1.0662](https://github.com/vim/vim/commit/da090f95df6c015e4f7fc9e1036795a370503a83): filecopy() may return wrong value when readlink() fails