Update zricethezav/gitleaks Docker tag to v8.15.3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
zricethezav/gitleaks	image-name	patch	v8.15.2 -> v8.15.3

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Release Notes

zricethezav/gitleaks

### [`v8.15.3`](https://togithub.com/zricethezav/gitleaks/releases/tag/v8.15.3) [Compare Source](https://togithub.com/zricethezav/gitleaks/compare/v8.15.2...v8.15.3) ##### Changelog - [`afdccad`](https://togithub.com/zricethezav/gitleaks/commit/afdccad) Add missing GitLab token patterns ([#​1077](https://togithub.com/zricethezav/gitleaks/issues/1077)) - [`e002920`](https://togithub.com/zricethezav/gitleaks/commit/e002920) Fix rule for private keys ([#​1072](https://togithub.com/zricethezav/gitleaks/issues/1072))

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Configuration

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