Update keymint latest aidl for cpp version code

This add a cpp default so that the latest cpp code can be
used across the codebase. When this is changed we dont
need to bump versions across multiple files and can just
change it in this one file.

Test: Run and tested using `atest keystore2_test` for Rust test and CTS test with `atest CtsKeystoreTestCases`
Bug: 244730020
Change-Id: Ifae1c5f2403210c2dec1bc337553fbbde73ed4c8