Update version to v1.17.15

[willhickey]

Nothing in this commit except the version bump:

$ glol -1
97eb9f2dc2 2024-01-02 16:42:01 -0600  (HEAD -> version_bump_v1.17.15, origin/version_bump_v1.17.15)  will.hickey@solana.com Update version to v1.17.15
$ git diff v1.17..HEAD | grep -vE "^ |^@@ |^--- |^\+\+\+ |^index |^diff |^-( \")?solana.*1.17.14|^\+( \")?solana.*1.17.15|^-version|^\+version"
$

[mergify]

automerge label removed due to a CI failure

[yihau]

let me check the error 🫠

[yihau]

I'm going to merge this PR cuz the error is not related to the version bump. will have another PR to pin ahash verison.

[yihau]

the PR: #34636