[llvm] Step down as a WebAssembly backend maintainer. (PR #147404)

[Nikita Popov via llvm-commits]

nikic wrote:

@aheejin @sbc100 @tlively @dschuff Anyone willing to step up as the new WebAssembly maintainer? (Can also be multiple people.)

https://github.com/llvm/llvm-project/pull/147404