rcc

Merge pull request #260 from LeeMendelowitz/mysql8_json_support #1495

Job	Run time
Smoke test: stock R	3m 34s
pkgdown	2m 45s
windows-latest (release)	9m 28s
macos-latest (release)	7m 36s
windows-latest (4.1)	11m 14s
ubuntu-20.04 (release)	4m 19s
windows-latest (4.2)	12m 50s
ubuntu-22.04 (devel)	3m 25s
ubuntu-22.04 (release) with covr	4m 7s
ubuntu-22.04 (oldrel-1)	3m 48s
ubuntu-22.04 (oldrel-2)	3m 57s
ubuntu-22.04 (oldrel-3)	3m 43s
ubuntu-22.04 (oldrel-4)	4m 8s
macOS-latest (release) mariadb_config	6m 21s
macOS-latest (release) mysql_config	7m 40s
ubuntu-22.04 (release) MySQL server + client	3m 20s
ubuntu-22.04 (release) MariaDB server, MySQL client	3m 18s
ubuntu-22.04 (release) MySQL server, MariaDB client	4m 27s
ubuntu-22.04 (release) MariaDB server + client	3m 39s
	1h 43m 39s

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