fix(deps): update dependency pg to v8.13.0 (#810)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [pg](https://redirect.github.com/brianc/node-postgres)
([source](https://redirect.github.com/brianc/node-postgres/tree/HEAD/packages/pg))
| [`8.12.0` ->
`8.13.0`](https://renovatebot.com/diffs/npm/pg/8.12.0/8.13.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/pg/8.13.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/pg/8.13.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/pg/8.12.0/8.13.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/pg/8.12.0/8.13.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>brianc/node-postgres (pg)</summary>

###
[`v8.13.0`](https://redirect.github.com/brianc/node-postgres/compare/[email protected]@8.13.0)

[Compare
Source](https://redirect.github.com/brianc/node-postgres/compare/[email protected]@8.13.0)

</details>

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