Use pg_available_extensions() instead of pg_pltemplate for postgres 13 compatibility #227
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See #226
pg_pltemplate was removed in postgres 13. We can query from
pg_available_extensions() and join with pg_language to find out which
language extensions are installed.
https://www.postgresql.org/docs/13/release-13.html#id-1.11.6.7.5.14