LDC 1.40.0-beta1

[kinke]

Glad to announce the first beta for LDC 1.40. Major changes:

* Based on D ~2.110.0 (today's upstream stable).
* LLVM for prebuilt packages bumped to v18.1.8 (incl. macOS 
arm64).
* Android: NDK for prebuilt package bumped from r26d to r27.

Full release log and downloads: 
https://github.com/ldc-developers/ldc/releases/tag/v1.40.0-beta1

Please help test, and thanks to all contributors & sponsors!