Add CRYPTO_FREE_REF to ossl_quic_free_token_store

Add CRYPTO_FREE_REF to ossl_quic_free_token_store

ossl_quic_free_token_store doesn't call CRYPTO_FREE_REF on the
hdl->reference object, which could lead to memory leaks on platforms
that don't support atomics (where the call to CRYPTO_NEW_REF allocates a
mutex as part of its function.  It wasn't caught before because all the
platforms we do ci on support threads.

Fixes #28241

Reviewed-by: Saša Nedvědický <sashan@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/28247)