Unexpected WARNING(s) when compiler-nix-name = ghc96*.

[zeme-wana]

Describe the bug

Unexpected WARNINGS are traced when setting compiler-nix-name = ghc96* in cabalProject'.

❌ With ghc96:

trace: WARNING: 9.6.2 is out of date, consider using 9.6.4.
trace: WARNING: 9.6.2 is out of date, consider using 9.6.4.
trace: WARNING: 9.6.2 is out of date, consider using 9.6.4.

✅ With ghc964:

trace: WARNING: 9.6.4 is out of date, consider using 9.6.5.

✅ With ghc962:

trace: WARNING: 9.6.2 is out of date, consider using 9.6.5.

❌ With ghc965:

trace: WARNING: 9.6.2 is out of date, consider using 9.6.4.
trace: WARNING: 9.6.2 is out of date, consider using 9.6.4.
trace: WARNING: 9.6.2 is out of date, consider using 9.6.4.

• Build system: x86_64-linux and aarch64-darwin.
• GHC version: ghc96*
• Haskell.nix version: current master 88f20f0876efc11eff32fffc1b9721e6bee3868f

Steps To Reproduce

See #2201

git fetch 
git checkout ghc96-oddity
cd __hs__
nix develop  

Expected behavior

No warnings when using ghc96 or ghc965

[hamishmack]

This has been fixed