Bump mkdocs-build-plantuml-plugin from 1.6.0 to 1.7.3

Bumps mkdocs-build-plantuml-plugin from 1.6.0 to 1.7.3.

Commits

• 7dca36d forgot to change renaming the calling function #21
• 97c4ef8 Update plantuml.py
• 55cd777 #18 wrong entry modified
• 2d35aa2 #18 minor typo in example, adding README entry for #20
• 61515ba prepare for 1.7.0, #20
• ce33307 #20 added parameter disable_ssl_certificate_validation, bool
• See full diff in compare view

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