Merge branch 'develop-readme-ghc9.10'. Close #590.

**Description**

Copilot is currently able to work with GHC 9.10, but the README still indicates
that it is compatible with versions up to 9.8. That needs to be updated.

**Type**

- Maintenace: Update README to reflect compatibility with new version of the
  compiler.

**Additional context**

None.

**Requester**

- Ivan Perez.

**Method to check presence of bug**

Not applicable (not a bug).

**Expected result**

The README indicates that Copilot is compatible with versions of GHC up to 9.10
(as of this writing).

**Solution implemented**

Update mention of the GHC version in the README to 9.10.

**Further notes**

None.

Author: ivanperez-keera

copilot/CHANGELOG

@@ -1,5 +1,6 @@
-2025-01-30
+2025-01-31
         * Include missing dependencies in installation instructions. (#591)
+        * Update version of GHC in README. (#590)
 
 2025-01-07
         * Version bump (4.2). (#577)

copilot/README.md

@@ -100,7 +100,7 @@ ghci> ghci> Leaving GHCi.
 On other Linux distributions or older Debian-based distributions, to use
 Copilot you must install a Haskell compiler (GHC) and the package manager
 Cabal. We currently support all versions of GHC from 8.6.5 to modern versions
-(9.8 as of this writing). You can install the toolchain using
+(9.10 as of this writing). You can install the toolchain using
 [ghcup](https://www.haskell.org/ghcup/) or, if you are on Debian/Ubuntu,
 you can use `apt-get` to install all dependencies as follows: