chore(deps): update actions/checkout action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v5 -> v6

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Release Notes

actions/checkout (actions/checkout)

v6

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Slowest examples

Top 10 slowest examples (13.15 seconds, 78.81% of total time)

Example	Description	Time in seconds
spec/mysql_client_installation_package_spec.rb:10	test::installation_client using el7 installs mysql_client_installation_package[default] when version is 5.6	2.47538
spec/mysql_client_installation_package_spec.rb:19	test::installation_client using el7 installs mysql_client_installation_package[default] when version is 5.7	1.20387
spec/mysql_server_installation_package_spec.rb:19	test::installation_server using el7 installs mysql_server_installation_package[default] when version is 5.7	1.18787
spec/mysql_server_installation_package_spec.rb:39	test::installation_server using el8 installs mysql_server_installation_package[default] when version is 8.0	1.1865
spec/mysql_client_installation_package_spec.rb:39	test::installation_client using el8 installs mysql_client_installation_package[default] when version is 8.0	1.1855
spec/mysql_client_installation_package_spec.rb:61	test::installation_client using ubuntu 18.04 installs mysql_client_installation_package[default] when version is 5.7	1.18508
spec/mysql_server_installation_package_spec.rb:30	test::installation_server using el8 installs mysql_server_installation_package[default] when version is 5.7	1.18475
spec/mysql_server_installation_package_spec.rb:10	test::installation_server using el7 installs mysql_server_installation_package[default] when version is 5.6	1.18182
spec/mysql_client_installation_package_spec.rb:30	test::installation_client using el8 installs mysql_client_installation_package[default] when version is 5.7	1.18117
spec/mysql_server_installation_package_spec.rb:70	test::installation_server using ubuntu 18.04 installs mysql_server_installation_package[default] when version is 5.7	1.17979