[Snyk] Security upgrade @google-cloud/logging-winston from 0.11.1 to 6.0.0

[pedroarapua]

Snyk has created this PR to fix 9 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• cloud-sql/postgres/knex/package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Regular Expression Denial of Service (ReDoS) SNYK-JS-ANSIREGEX-1583908	696
	Prototype Pollution SNYK-JS-GRPCGRPCJS-1038818	696
	Prototype Pollution SNYK-JS-JSONBIGINT-608659	696
	Missing Release of Resource after Effective Lifetime SNYK-JS-INFLIGHT-6095116	631
	Open Redirect SNYK-JS-NODEFORGE-2330875	586
	Improper Verification of Cryptographic Signature SNYK-JS-NODEFORGE-2430339	579
	Prototype Pollution SNYK-JS-NODEFORGE-2331908	529
	Improper Verification of Cryptographic Signature SNYK-JS-NODEFORGE-2430337	494
	Improper Verification of Cryptographic Signature SNYK-JS-NODEFORGE-2430341	494

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• Check the changes in this PR to ensure they won't cause issues with your project.
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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Regular Expression Denial of Service (ReDoS)
🦉 Prototype Pollution
🦉 Open Redirect