meson: upgrade to 1.7.0

meson: upgrade to 1.7.0

Summary of changes:
- New custom dependency for atomic
- --cap-lints allow used for Cargo subprojects
- Cargo features are resolved globally
- Meson can run "clippy" on Rust projects
- Devenv support in external project module
- Fixed sizeof and find_library methods for Fortran compilers
- format command now accept stdin argument
- "machine" entry in target introspection data
- Add new language Linear Asm
- Control the number of child processes with an environment variable
- Support for Rust 2024
- Support TASKING VX-Toolset
- Test targets no longer built by default
- Install vcs_tag() output

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>