chore: compile on pg16

[steve-chavez]

Only tests that we compile on pg16, it doesn't test the features on pg16 yet (see #61 (comment)). It depends on removing pg_cron from tests (see #76 (comment)).

[soedirgo]

sadness ensues

       > sed 's,EXTVERSION,1.0.4,g; s,EXTNAME,pg_tle,g; s,SCHEMA,pgtle,g' pg_tle.control.in > pg_tle.control;
       > installing
       > cp: missing destination file operand after '/nix/store/3nfq9nxb8m5zmv5wnwfgzshgdpyjhl8n-pg_tle-1.0.4/lib'
       > Try 'cp --help' for more information.

[steve-chavez]

@soedirgo Hm, you mean pg_tle fails in pg 16? I can't seem to reproduce.

Anyway, if pg_tle is an issue maybe we can replace it by a contrib extension in the tests. Will work on that on another PR.