ci: find liblzma >= 5.6.3 on windows msvc tests (#2421)

ci: find liblzma >= 5.6.3 on windows msvc tests (#2421)

We currently use XZ Utils 5.6.3 on windows CI jobs, but the Windows
(msvc)
job which uses cmake seems to only be looking for the old library name,
liblzma.lib:

```
-- Looking for lzma_auto_decoder in C:/Program Files (x86)/xz/lib/liblzma.lib
-- Looking for lzma_auto_decoder in C:/Program Files (x86)/xz/lib/liblzma.lib - not found
-- Looking for lzma_easy_encoder in C:/Program Files (x86)/xz/lib/liblzma.lib
-- Looking for lzma_easy_encoder in C:/Program Files (x86)/xz/lib/liblzma.lib - not found
-- Looking for lzma_lzma_preset in C:/Program Files (x86)/xz/lib/liblzma.lib
-- Looking for lzma_lzma_preset in C:/Program Files (x86)/xz/lib/liblzma.lib - not found
-- Could NOT find LibLZMA (missing: LIBLZMA_HAS_AUTO_DECODER LIBLZMA_HAS_EASY_ENCODER LIBLZMA_HAS_LZMA_PRESET) (found version "5.6.3")
```

We need to update build/ci/github_actions/ci.cmd to look for lzma.lib
instead.