fix(deps): update dependency pg-connection-string to v2.6.0 (#3886)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[pg-connection-string](https://togithub.com/brianc/node-postgres/tree/master/packages/pg-connection-string)
([source](https://togithub.com/brianc/node-postgres)) | [`2.5.0` ->
`2.6.0`](https://renovatebot.com/diffs/npm/pg-connection-string/2.5.0/2.6.0)
|
[![age](https://badges.renovateapi.com/packages/npm/pg-connection-string/2.6.0/age-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://badges.renovateapi.com/packages/npm/pg-connection-string/2.6.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://badges.renovateapi.com/packages/npm/pg-connection-string/2.6.0/compatibility-slim/2.5.0)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://badges.renovateapi.com/packages/npm/pg-connection-string/2.6.0/confidence-slim/2.5.0)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>brianc/node-postgres</summary>

###
[`v2.6.0`](https://togithub.com/brianc/node-postgres/blob/HEAD/CHANGELOG.md#v260)

[Compare
Source](https://togithub.com/brianc/node-postgres/compare/[email protected]@2.6.0)

-   Respect PGSSLMODE environment variable

</details>

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yarn.lock

@@ -5829,12 +5829,12 @@ pg-cloudflare@^1.1.0:
   resolved "https://registry.yarnpkg.com/pg-cloudflare/-/pg-cloudflare-1.1.0.tgz#833d70870d610d14bf9df7afb40e1cba310c17a0"
   integrity sha512-tGM8/s6frwuAIyRcJ6nWcIvd3+3NmUKIs6OjviIm1HPPFEt5MzQDOTBQyhPWg/m0kCl95M6gA1JaIXtS8KovOA==
 
-[email protected], pg-connection-string@^2.5.0:
+[email protected]:
   version "2.5.0"
   resolved "https://registry.yarnpkg.com/pg-connection-string/-/pg-connection-string-2.5.0.tgz#538cadd0f7e603fc09a12590f3b8a452c2c0cf34"
   integrity sha512-r5o/V/ORTA6TmUnyWZR9nCj1klXCO2CEKNRlVuJptZe85QuhFayC7WeMic7ndayT5IRIR0S0xFxFi2ousartlQ==
 
-pg-connection-string@^2.6.0:
+pg-connection-string@^2.5.0, pg-connection-string@^2.6.0:
   version "2.6.0"
   resolved "https://registry.yarnpkg.com/pg-connection-string/-/pg-connection-string-2.6.0.tgz#12a36cc4627df19c25cc1b9b736cc39ee1f73ae8"
   integrity sha512-x14ibktcwlHKoHxx9X3uTVW9zIGR41ZB6QNhHb21OPNdCCO3NaRnpJuwKIQSR4u+Yqjx4HCvy7Hh7VSy1U4dGg==