This reverts commit 8d097bc472fc66221dee23bb8f9e0dddac16db23.

* [DOC] Add back Rust 1.85.0 requirement to NEWS.md

Addresses k0kubun's review in https://github.com/ruby/ruby/pull/15711#issuecomment-3690541074

NEWS.md serves both CRuby developers as well as end-users. As the
release date closes in, it probably gets seen by more users than
core developers (on the blog for example).

Most users probably don't build Ruby by hand, and instead that is
abstracted through tools like ruby-install or a package manager.
For some users these tools may install pre-built binaries where
they exist, in which case the Rust requirement doesn't apply. In
other instances, the tools merely automate the build, in which case
the correct rustc version is required to enable support.

It is also a little confusing to talk about "enabling support for
the JIT during the build" vs "enabling the JIT at runtime".

This copy attempts to balance all of the above and hopefully gets
the correct points across all intended audiences.

* Apply suggestion from k0kubun

Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>

---------

Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>

Test of 6.0.0 is not working with 4.0.0 stable version.

https://github.com/ruby/actions/actions/runs/20488398805/job/58875672023#step:20:362

```
  rake aborted!
  NoMethodError: undefined method 'cov_filter=' for #<Hoe:0x00007fdb550fc840> (NoMethodError)

    self.cov_filter = %w[ tmp ]
        ^^^^^^^^^^^^^
  /home/runner/work/actions/actions/ruby-4.0.0/gems/src/minitest/Rakefile:20:in 'block in <top (required)>'
  /home/runner/work/actions/actions/ruby-4.0.0/.bundle/gems/hoe-3.20.0/lib/hoe.rb:394:in 'BasicObject#instance_eval'
  /home/runner/work/actions/actions/ruby-4.0.0/.bundle/gems/hoe-3.20.0/lib/hoe.rb:394:in 'Hoe.spec'
  /home/runner/work/actions/actions/ruby-4.0.0/gems/src/minitest/Rakefile:11:in '<top (required)>'
  /home/runner/work/actions/actions/ruby-4.0.0/.bundle/gems/rake-13.3.1/exe/rake:27:in '<top (required)>'
  (See full trace by running task with --trace)
```

This reverts commit c17307ac22f37f74786a4f016121c6ee8cc38915.

3.7.5 is not working with rbs-3.10.0

https://github.com/ruby/ruby/actions/runs/20480628393/job/58853288287#step:22:353

```
  D:/a/ruby/ruby/src/.bundle/gems/test-unit-3.7.5/lib/test/unit/testcase.rb:641:in 'block (2 levels) in Test::Unit::TestCase#run': failed to allocate memory (NoMemoryError)
```