Update mysql-apt-config to 0.8.29-1

[dveeden]

In #413 the CI checks failed because of this:

 Hit:5 http://azure.archive.ubuntu.com/ubuntu focal-security InRelease
Hit:6 https://packages.microsoft.com/ubuntu/20.04/prod focal InRelease
Get:7 http://repo.mysql.com/apt/ubuntu focal InRelease [12.8 kB]
Err:7 http://repo.mysql.com/apt/ubuntu focal InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B7B3B788A8D3785C
Hit:8 http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu focal InRelease
Reading package lists...
W: GPG error: http://repo.mysql.com/apt/ubuntu focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B7B3B788A8D3785C
E: The repository 'http://repo.mysql.com/apt/ubuntu focal InRelease' is not signed.
Error: Process completed with exit code 100.

This PR is to update the CI checks to fix this.

[dveeden]

From mysql-apt-config changelog:

mysql-apt-config (0.8.29-1) bullseye bookworm focal jammy lunar; urgency=medium

  * Add latest gpg key

 -- Tanya Dixit <tanya.d.dixit@oracle.com>  Fri, 24 Nov 2023 10:34:13 +0100

[dveeden]

This fixes the CI setup, but the CI check still fails due to a call to a deprecated function: mysql_reload()

Run make test
"/usr/bin/perl" -MExtUtils::Command::MM -e 'cp_nonempty' -- mysql.bs blib/arch/auto/DBD/mysql/mysql.bs 644
PERL_DL_NONLAZY=1 "/usr/bin/perl" "-MExtUtils::Command::MM" "-MTest::Harness" "-e" "undef *Test::Harness::Switches; test_harness(0, 'blib/lib', 'blib/arch')" t/*.t

#   Failed test 'use DBD::mysql;'
#   at t/00base.t line 15.
#     Tried to use 'DBD::mysql'.
Bailout called.  Further testing stopped:  Unable to load DBD::mysql
#     Error:  Can't load '/home/runner/work/DBD-mysql/DBD-mysql/blib/arch/auto/DBD/mysql/mysql.so' for module DBD::mysql: /home/runner/work/DBD-mysql/DBD-mysql/blib/arch/auto/DBD/mysql/mysql.so: undefined symbol: mysql_reload at /usr/lib/x86_64-linux-gnu/perl-base/DynaLoader.pm line 187.