v1.15.4

What's Changed

• Bump lxml from 6.0.3 to 6.1.0 by @dependabot[bot] in #834
• Bump gitpython from 3.1.46 to 3.1.47 by @dependabot[bot] in #835
• Bump versions by @dependabot[bot] in #837
• Bump dev-requirements by @dependabot[bot] in #836
• Update requirements.txt by @babenek in #839
• PEM key detector improvements by @babenek in #840

Full Changelog: v1.15.3...v1.15.4