fix(deps): update rust crate solana-program to 1.16.15

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
solana-program (source)	dependencies	patch	1.16.14 -> 1.16.15

---

Release Notes

solana-labs/solana (solana-program)

### [`v1.16.15`](https://togithub.com/solana-labs/solana/releases/tag/v1.16.15): Mainnet - v1.16.15 [Compare Source](https://togithub.com/solana-labs/solana/compare/v1.16.14...v1.16.15) This is a stable release suitable for use on Mainnet Beta v1.16 removes `solana-sys-tuner`. For manual tuning please see these [System Tuning instructions](https://docs.solana.com/running-validator/validator-start#system-tuning) - In previous v1.16 releases, the `TransactionStatus` and `AddressSignatures` columns were not properly cleaned. This could have resulted in excessive storage use for nodes running with `--enable-rpc-transaction-history`. This has been fixed with [https://github.com/solana-labs/solana/pull/32548](https://togithub.com/solana-labs/solana/pull/32548) #### Changes - v1.16: Drops the shrink_candidate_slots lock after done inserting (backport of [#​33459](https://togithub.com/solana-labs/solana/issues/33459)) ([#​33466](https://togithub.com/solana-labs/solana/issues/33466)) - v1.16: Fixup the metrics for remove_dead_accounts_shrink_us (backport of [#​33458](https://togithub.com/solana-labs/solana/issues/33458)) ([#​33464](https://togithub.com/solana-labs/solana/issues/33464)) - v1.16: AccountsBackgroundService gracefully exits when snapshot request handling errors (backport of [#​32543](https://togithub.com/solana-labs/solana/issues/32543)) ([#​33447](https://togithub.com/solana-labs/solana/issues/33447)) - v1.16: reduce WARN logging to only necessary scenario (backport of [#​33408](https://togithub.com/solana-labs/solana/issues/33408)) ([#​33445](https://togithub.com/solana-labs/solana/issues/33445)) - v1.16: Update is_locked_out cache when adopting on chain vote state (backport of [#​33341](https://togithub.com/solana-labs/solana/issues/33341)) ([#​33403](https://togithub.com/solana-labs/solana/issues/33403)) - v1.16: purge duplicated bank prioritization fee from cache (backport of [#​33062](https://togithub.com/solana-labs/solana/issues/33062)) ([#​33254](https://togithub.com/solana-labs/solana/issues/33254))

---

Configuration

📅 Schedule: Branch creation - "every weekend" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by Mend Renovate. View repository job log here.