pg_collector update queries against pg_stat_statements for postgres 13

[thottr]

The columns in the view pg_stat_statements (created by the postgres extension pg_stat_statements) has changed in postgres 13. Queries against pg_stat_statements, in pg_collector should be updated to reflect the new column names.

[mmohali]

i fixed it i pg-collector V1 for PostgreSQL 13 https://github.com/awslabs/pg-collector/releases/tag/pg-collector-V1-for-PostgreSQL-13

Starting from PostgreSQL 13, PG Collector will have a dedicated script for each PostgreSQL major version .

each PG Collector major version will have it is own branch and the main branch will be for PG Collector that support PostgreSQL 12 and older versions
i updated the main https://github.com/awslabs/pg-collector read me for the new Versioning Policy , please take a look .
to access pg-collector releases https://github.com/awslabs/pg-collector/releases