add Nim 1.6.10

[ee7]

Links:

• https://nim-lang.org/blog/2022/11/23/version-1610-released.html
• https://github.com/nim-lang/Nim/compare/v1.6.8...v1.6.10
• https://forum.nim-lang.org/t/9643

Previous bump: https://github.com/iffy/install-nim/pull/25

---

Double-checking that it's the correct nightly release:

$ cd /tmp
$ curl -sSfL -o 1.tar.xz https://nim-lang.org/download/nim-1.6.10-linux_x64.tar.xz
$ curl -sSfL -o 2.tar.xz https://github.com/nim-lang/nightlies/releases/download/2022-11-21-version-1-6-f1519259f85cbdf2d5ff617c6a5534fcd2ff6942/nim-1.6.10-linux_x64.tar.xz
$ diff -s 1.tar.xz 2.tar.xz
Files 1.tar.xz and 2.tar.xz are identical

[iffy]

Man, you're fast!

[ee7]

Man, you're fast!

You too! Thanks for the quick release.