mod: bump github.com/microcosm-cc/bluemonday from 1.0.17 to 1.0.21

[dependabot]

Bumps github.com/microcosm-cc/bluemonday from 1.0.17 to 1.0.21.

Release notes

Sourced from github.com/microcosm-cc/bluemonday's releases.

Very minor bug fix to remove empty elements without attributes

Thanks to @​Gusted for microcosm-cc/bluemonday#151 which fixes a bug that allowed a policy to be defined in a way that input could've allowed an empty and meaningless element to be left in the output when it should not have done so.

This is not a security issue, and the details can be seen in the PR comment.

Updated x/net/html

This is an update of dependencies, specifically it updates the HTML parser within go/net/html.

The update removes a capability, Microsoft style comments that allow browser conditionals no longer works. This is due to a fix on the part of the Go team to prevent XSS within HTML comments, and the commit in question is here golang/net@06994584 . There is no easy to see safe way to restore that functionality without adding more risk to those who .AllowComments() and so I am accepting that this non-standard use of HTML comments is no longer supported.

As part of this version, the older release of v1.0.19 is retracted.

Add SVG inline images, improve RGB color and length matching, fix bug

What's Changed

• css: improve RGB hex color and length matching by @​hochhaus in microcosm-cc/bluemonday#142
• css: add support for image/svg+xml for data-uri inline images
• html: fix double-escaping of content within HTML attributes
• tests: added more tests to provide examples of proofs of some open issues

New Contributors

• @​hochhaus made their first contribution in microcosm-cc/bluemonday#142

Full Changelog: microcosm-cc/bluemonday@v1.0.18...v1.0.19

Fix bug in iframe sandboxvalues

What's Changed

• Fix incorrect handling of iframe SandboxValues by @​kiwiz in microcosm-cc/bluemonday#138

Full Changelog: microcosm-cc/bluemonday@v1.0.17...v1.0.18

Commits

• 1ee3c12 go mod && go fmt: update dependencies and format code
• 07c5693 Merge pull request #151 from Gusted/self-closing-tag-bug
• cc9997e Don't write self-closing tag with empty attributes
• 705c34a Updated x/net/html to ensure latest version from the Go team, retracted v1.0....
• 84409dd Only test n-1 Go versions
• 8fc9802 Merge branch 'main' of github.com:microcosm-cc/bluemonday into main
• c66f9ff Updated Go version, retract old versions of this package which are always con...
• a232bac Removed outdated build badge
• 97a5b1f Test recent Go versions
• 9ec48cf Test recent Go versions
• Additional commits viewable in compare view

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[dependabot]

Dependabot tried to add @unknwon as a reviewer to this PR, but received the following error from GitHub:

POST https://api.github.com/repos/CodeCmn/gogs/pulls/25/requested_reviewers: 422 - Reviews may only be requested from collaborators. One or more of the users or teams you specified is not a collaborator of the CodeCmn/gogs repository. // See: https://docs.github.com/rest/reference/pulls#request-reviewers-for-a-pull-request

[dependabot]

Superseded by #31.