chore(deps): update zricethezav/gitleaks docker tag to v8.20.1

This MR contains the following updates:

Package	Type	Update	Change
zricethezav/gitleaks	image-name	minor	v8.19.3 -> v8.20.1

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Release Notes

gitleaks/gitleaks (zricethezav/gitleaks)

v8.20.1

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Changelog

• b2fbaeb feat(config): add placeholder regexes to global allowlist (#​1547)
• 00bb821 feat: add PrivateAI rule (#​1548)
• 445abe3 Bump golang verion used in docker build to match version specified in go.mod (#​1551)
• 1a2f656 feat: add cohere rule (#​1549)
• 82d737d feat(generate): generate global (#​1546)
• f6e5499 Feat/nuget config password rule (#​1540)

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