Update matrix-sdk-crypto-wasm to `15.0.0` (#4882)
For js-sdk users, this includes the following:
- Send stable identifier `sender_device_keys` for MSC4147 (Including device keys with Olm-encrypted events).
([#4964](https://github.com/matrix-org/matrix-rust-sdk/pull/4964))
- Check the `sender_device_keys` field on _all_ incoming Olm-encrypted to-device messages and ignore any to-device messages which include the field but whose data is invalid (as per [MSC4147](https://github.com/matrix-org/matrix-spec-proposals/pull/4147)).
([#4922](https://github.com/matrix-org/matrix-rust-sdk/pull/4922))
- Fix bug which caused room keys to be unnecessarily rotated on every send in the presence of blacklisted/withheld devices in the room.
([#4954](https://github.com/matrix-org/matrix-rust-sdk/pull/4954))
- Fix [matrix-rust-sdk#2729](https://github.com/matrix-org/matrix-rust-sdk/issues/2729) which in rare cases can cause room key oversharing.
([#4975](https://github.com/matrix-org/matrix-rust-sdk/pull/4975))
