Bump version to v2.1.4

[github-actions]

No description provided.

[willhickey]

CI is red here because of RUSTSEC-2024-0399. That would be resolved by #3791 but CI is red on that one until this version bump is merged.

I'd like to merge this one first. Here's the confirmation that there's nothing in this PR other than the version bump:

$ glol -2
087bfeaff9 2024-11-25 20:42:25 +0000  (HEAD -> version-bump-v2.1.4, agave/version-bump-v2.1.4)  41898282+github-actions[bot]@users.noreply.github.com Bump version to v2.1.4
970606e842 2024-11-25 15:27:46 -0500  (tag: v2.1.3, tag: agave/v2.1.3)  37929162+mergify[bot]@users.noreply.github.com v2.1: Marks old storages as dirty and uncleaned in clean_accounts() (backport of #3737) (#3748)
$ git diff agave/v2.1.3..HEAD | grep -vE "^ |^@@ |^--- |^\+\+\+ |^index |^diff |^-( \")?(solana|agave).*2.1.3|^\+( \")?(solana|agave).*2.1.4|^-version|^\+version"
$

[willhickey]

Merge conflict caused by #3523 adding solana-tpu-client-next to Cargo.toml since this was branched.