rust-analyzer: update to 2023.07.31.

[icp1994]

Testing the changes

• I tested the changes in this PR: YES

Local build testing

• I built this PR locally for my native architecture: x86_64

[classabbyamp]

we should probably be building this in the rust template as a component (maybe rustfmt too) at some point, to ensure compat with the packaged rust

[icp1994]

My understanding from the official release blog post is that we should continue updating it separately.

Most users should continue to use the releases provided by the rust-analyzer team (available on the rust-analyzer releases page), which are published more frequently.