Update htmldate requirement from ==1.7.* to >=1.7,<1.9

[dependabot[bot]]

Updates the requirements on htmldate to permit the latest version.

Release notes

Sourced from htmldate's releases.

htmldate-1.8.0

• change license to Apache 2.0 (#140)
• compile XPath expressions (#136)
• update docs with @​EkaterineSheshelidze (#135)

Changelog

Sourced from htmldate's changelog.

1.8.0

• change license to Apache 2.0 (#140)
• compile XPath expressions (#136)
• update docs with @​EkaterineSheshelidze (#135)

1.7.0

• fix meta property updated vs. original behavior (#121)
• support for LXML version 5.0+ (#127)
• fix image links in Readme

1.6.1

• fix for MacOS: pin LXML dependency with @​adamh-oai

1.6.0

• focus on precision, stricter extraction patterns (#103, #105, #106, #112)
• simplified code base (#108, #109)
• replaced lxml.html.Cleaner (#104)
• extended evaluation

1.5.2

• fix for missing months keys in custom extractor (#100)
• fix for None in try_date_expr() (#101)

1.5.1

• fix regression for fast extraction introduced in e8b3538 (#96)
• fix setup by making backports-datetime-fromisoformat optional (#95)

1.5.0

• slightly higher accuracy with revised heuristics
• simplified code structure for better performance
• setup: support for 3.12, fromisoformat backport if applicable
• HTML parsing fixes: more lenient parsing, pinned LXML version for MacOS

1.4.3

• maintenance release: upgrade urllib3 dependency

1.4.2

• support min_date/max_date as datetimes or datetime strings with @​kernc (#73)
• add date attributes to HTML extraction with @​kernc (#74)
• fix for extraction of updated and original dates in time elements
• code refactoring and maintenance

1.4.1

• better coverage of relevant HTML attributes
• automatically define upper time bound at each function call (#70)
• reviewed and simplified extraction code
• cache validation for format diverging from %Y-%m-%d
• updated dependencies and removed real-world tests from package

1.4.0

... (truncated)

Commits

• 3e8ba44 prepare version 1.8.0 (#141)
• 9149a7e change license to Apache 2.0 (#140)
• ac28c00 update documentation (#135)
• 80a3024 build(deps): update github actions (#137)
• 7ed2831 update setup and tests, compile XPath expressions (#136)
• 0faec09 adjust image links (#130)
• See full diff in compare view

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[dependabot[bot]]

Looks like htmldate is no longer updatable, so this is no longer needed.