[Snyk] Security upgrade @google-cloud/logging-winston from 4.1.0 to 6.0.0

[tamnk74]

Snyk has created this PR to fix 5 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• package.json
• package-lock.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	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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🦉 Open Redirect
🦉 Prototype Pollution