Upgrade `syn` to `2` (#129) (#135) #668

Job	Run time
Compile MySQL (live/mysql)	1m 0s
Compile MySQL (discovery/mysql)	1m 1s
Rustfmt	12s
Clippy	1m 1s
Compile SQLite (live/sqlite)	55s
Compile MySQL (writer/mysql)	59s
Compile SQLite (discovery/sqlite)	54s
Unit Test	1m 15s
Compile SQLite (writer/sqlite)	54s
Compile Postgres (live/postgres)	57s
Compile Postgres (discovery/postgres)	58s
Compile Postgres (writer/postgres)	1m 1s
SQLite (live/sqlite)	32s
SQLite (discovery/sqlite)	30s
SQLite (writer/sqlite)	23s
MariaDB (10.6, live/mysql)	42s
MariaDB (10.6, discovery/mysql)	53s
MariaDB (10.6, writer/mysql)	34s
MySQL (8, live/mysql)	52s
MySQL (8, discovery/mysql)	37s
MySQL (8, writer/mysql)	45s
MySQL (5.7, live/mysql)	42s
MySQL (5.7, discovery/mysql)	51s
MySQL (5.7, writer/mysql)	37s
Postgres (14.4, live/postgres)	51s
Postgres (14.4, discovery/postgres)	57s
Postgres (14.4, writer/postgres)	1m 2s
	21m 55s

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