Update module go-pg/pg/v9 to v9.1.6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/go-pg/pg/v9	require	patch	v9.1.1 -> v9.1.6

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Release Notes

go-pg/pg

### [`v9.1.6`](https://togithub.com/go-pg/pg/compare/v9.1.5...v9.1.6) [Compare Source](https://togithub.com/go-pg/pg/compare/v9.1.5...v9.1.6) ### [`v9.1.5`](https://togithub.com/go-pg/pg/compare/v9.1.4...v9.1.5) [Compare Source](https://togithub.com/go-pg/pg/compare/v9.1.4...v9.1.5) ### [`v9.1.4`](https://togithub.com/go-pg/pg/compare/v9.1.3...v9.1.4) [Compare Source](https://togithub.com/go-pg/pg/compare/v9.1.3...v9.1.4) ### [`v9.1.3`](https://togithub.com/go-pg/pg/compare/v9.1.2...v9.1.3) [Compare Source](https://togithub.com/go-pg/pg/compare/v9.1.2...v9.1.3) ### [`v9.1.2`](https://togithub.com/go-pg/pg/compare/v9.1.1...v9.1.2) [Compare Source](https://togithub.com/go-pg/pg/compare/v9.1.1...v9.1.2)

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