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MariaDB 11.5 support

This commit marks MariaDB 11.5 as a supported DB flavor, now that its GA
release occurred on 14 Aug 2024. This is a rolling (short term support)
MariaDB server release.

Note the following schema management impacts of MariaDB 11.5:

* MariaDB 11.5 changes the default collation for Unicode character sets to use
  uca1400_ai_ci collations. See MDEV-25829. This only required a minor tweak
  to one of Skeema's test suite helper functions. Aside from this, uca1400
  collation support was already added in ee25133 (Skeema v1.11.1).

* Prior to MariaDB 11.5, the TIMESTAMP column type suffered from the Y2K38
  limitation. This has now been solved; see MDEV-32188. Skeema's lint-has-time
  annotation message has been adjusted accordingly for MariaDB, depending on
  the server version.

* Users of foreign keys should note that MariaDB 11.5.2 suffers from bug
  MDEV-34756, which means that when you ALTER a table to add a new foreign
  key, the existing data in the table is not validated against the new
  constraint by default, even with foreign_key_checks=ON. For a workaround,
  set global variable innodb_alter_copy_bulk to OFF for now. We expect the
  next quarter's MariaDB server releases to fix this bug. However, since 11.5
  is a rolling release, there won't be a MariaDB 11.5.3 release, as rolling
  releases don't have updates after GA (X.Y.2).

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