Why doesn't Git use more modern SHA?

Why doesn't Git use more modern SHA?

git cryptography sha

git

How does Git(Hub) handle possible collisions from short SHAs?

git cryptography github sha

git

What's the difference between 'Commit ID' and 'SHA1 Hash' in GIT? [duplicate]

git cryptography

git

Git is moving to new hashing algorithm SHA-256 but why git community settled on SHA‑256

git hash cryptography

git

What happens to OpenPGP-signed git commits after key expiration?

git cryptography pgp openpgp key-management

git