build(deps): bump html5rdf from 1.2.0 to 1.2.1 in /docker/latest

[dependabot]

Bumps html5rdf from 1.2.0 to 1.2.1.

Release notes

Sourced from html5rdf's releases.

v1.2.1

Re-release as html5rdf

• Fix packaging to include test data
• Release a new tagged version

Changelog

Sourced from html5rdf's changelog.

1.2.1

Forked to html5rdf project for the rdflib library.
Removed the deprecated sanitization module.
1.2

Unreleased yet
Features:

Add support for the <wbr> element in the sanitizer, which indicates a line break opportunity <https://html.spec.whatwg.org/#the-wbr-element>_.

This element is allowed by default. (#395) (Thank you, Tom Most!)
Add support for serializing the <ol reversed> boolean attribute. (Thank

you, Tom Most!) (#396)
The <ol reversed> and <ol start> attributes are now permitted by the

sanitizer. (#321) (Thank you, Tom Most!)

Bug fixes:

The sanitizer now permits <summary> tags. It used to allow <details>

already. (#423)

1.1


Released on June 23, 2020
Breaking changes:

Drop support for Python 3.3. (#358)
Drop support for Python 3.4. (#421)

Deprecations:

Deprecate the html5lib sanitizer (html5lib.serialize(sanitize=True) and
html5lib.filters.sanitizer). We recommend users migrate to Bleach <https://github.com/mozilla/bleach>. Please let us know if Bleach doesn't suffice for your
use. (#443)

Other changes:

Try to import from collections.abc to remove DeprecationWarning and ensure
html5lib keeps working in future Python versions. (#403)
Drop optional datrie dependency. (#442)

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[coveralls]

coverage: 90.334%. remained the same
when pulling e0fff13 on dependabot/pip/docker/latest/html5rdf-1.2.1
into 4b0f580 on main.