Update Rust crate html2text to 0.17

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
html2text	dependencies	minor	0.16 → 0.17

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Release Notes

jugglerchris/rust-html2text (html2text)

v0.17.1

Compare Source

• [added] Add support for XHTML (for the cases where it doesn't quite behave
  like HTML).

v0.17.0

Compare Source

• [changed] Split html2text example into html2text-cli crate
• [fixed] A possible panic when syntax-highlighting
• [changed] Update html5ever to 0.39.0

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