neovim, -devel: update to 0.12.1 and 20260407

[casr]

Description

• update neovim to 0.12.1
• update neovim-devel to 20260407

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 26.3 25D125 arm64
Command Line Tools 26.2.0.0.1.1764812424

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• referenced existing tickets on Trac with full URL in commit message?
• checked your Portfile with port lint?
• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?
• checked that the Portfile's most important variants haven't been broken?

[macportsbot]

Notifying maintainers:
@judaew for port neovim.
@l2dy for port neovim.

[judaew]

LGTM, ty <3