Update dependency gallery-dl to v1.28.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gallery-dl	==1.28.3 -> ==1.28.4

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Release Notes

mikf/gallery-dl (gallery-dl)

v1.28.4

Compare Source

Extractors

Additions

• [pexels] add support (#​2286, #​4214, #​6769)
• [weebcentral] add support (#​6778)

Fixes

• [bunkr] update to new site layout (#​6798, #​6805)
• [bunkr] fix ValueError on relative redirects (#​6790)
• [plurk] fix user data extraction and make it non-fatal (#​6742)

Improvements

• [bunkr] support /f/ media URLs
• [e621] accept tag search URLs with empty tag (#​6783)
• [pixiv] provide fallback URLs (#​6762)
• [wallhaven] extract search[tags] and search[tag_id] metadata (#​6772)

Miscellaneous

• [util] support not splitting value argument when calling contains() (#​6773)

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