Update `pg_store_plans` version and add `pg_stat_statements` to preload_libraries.

[EvanHStanton]

Update pg_store_plans release version

• As of 2024-Feb-05, version 1.8 has been released
• https://github.com/ossc-db/pg_store_plans/releases/tag/1.8

Add pg_stat_statements to Trunk.toml preload_libraries

• According to the regress.conf file, both pg_store_plans and pg_stat_statements are required as shared_preload_libraries
• https://github.com/ossc-db/pg_store_plans/blob/1.8/regress.conf
• Therefore, the following update to the [extension] section of the Trunk.toml was made:

  preload_libraries = ["pg_store_plans", "pg_stat_statements"]

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