ci: update support/B7B3B788A8D3785C.asc (fixes respository installs for MySQL tests)

[grooverdan]

from https://repo.mysql.com/RPM-GPG-KEY-mysql-2025

fingerprint the same per:

$ gpg --show-keys --fingerprint support/B7B3B788A8D3785C.asc 
pub   rsa4096 2023-10-23 [SC] [expires: 2027-10-23]
      BCA4 3417 C3B4 85DD 128E  C6D4 B7B3 B788 A8D3 785C
uid                      MySQL Release Engineering <mysql-build@oss.oracle.com>
sub   rsa4096 2023-10-23 [E] [expires: 2027-10-23]

[sodabrew]

Did I have the wrong key in there? Will have to check this out more carefully and see what's up. Was this causing a CI failure you can link to?

[grooverdan]

Did I have the wrong key in there? Will have to check this out more carefully and see what's up. Was this causing a CI failure you can link to?

https://github.com/brianmario/mysql2/actions/runs/22213107410/job/64251320451?pr=1423

[8](https://github.com/brianmario/mysql2/actions/runs/22213107410/job/64251320451?pr=1423#step:7:129)
Err:8 http://repo.mysql.com/apt/ubuntu jammy InRelease
  The following signatures were invalid: EXPKEYSIG B7B3B788A8D3785C MySQL Release Engineering <mysql-build@oss.oracle.com>
Reading package lists...
W: http://repo.mysql.com/apt/ubuntu/dists/jammy/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: GPG error: http://repo.mysql.com/apt/ubuntu jammy InRelease: The following signatures were invalid: EXPKEYSIG B7B3B788A8D3785C MySQL Release Engineering <mysql-build@oss.oracle.com>
E: The repository 'http://repo.mysql.com/apt/ubuntu jammy InRelease' is not signed.
Repository: 'deb http://repo.mysql.com/apt/ubuntu jammy mysql-8.0'

So previous key is expired - before this change:

$ gpg --show-keys --fingerprint support/B7B3B788A8D3785C.asc 
pub   rsa4096 2023-10-23 [SC] [expired: 2025-10-22]
      BCA4 3417 C3B4 85DD 128E  C6D4 B7B3 B788 A8D3 785C
uid                      MySQL Release Engineering <mysql-build@oss.oracle.com>
sub   rsa4096 2023-10-23 [E] [expired: 2025-10-22]