Bump dompurify from 2.4.9 to 2.5.6

[dependabot[bot]]

Bumps dompurify from 2.4.9 to 2.5.6.

Release notes

Sourced from dompurify's releases.

DOMPurify 2.5.6

• Fixed an issue with the execution logic of attribute hooks to prevent bypasses, thanks @​kevin-mizu
• Fixed a minor problem with the bower file pointing to the wrong dist path
• Updated several development dependencies

DOMPurify 2.5.5

• Fixed a minor issue with the dist paths in bower.js, thanks @​HakumenNC
• Fixed a minor issue with sanitizing HTML coming from copy&paste Word content, thanks @​kakao-bishop-cho

DOMPurify 2.5.4

• Fixed a bug with latest isNaN checks affecting MSIE, thanks @​tulach
• Fixed the tests for MSIE and fixed related test-runner

DOMPurify 2.5.3

• Fixed several mXSS variations found by and thanks to @​kevin-mizu & @​Ry0taK
• Added better configurability for comment scrubbing default behavior
• Added better hardening against Prototype Pollution attacks, thanks @​kevin-mizu
• Fixed some smaller issues in README and other documentation

DOMPurify 2.5.2

• Addressed and fixed a mXSS variation found by @​kevin-mizu
• Addressed and fixed a mXSS variation found by Adam Kues of Assetnote
• Updated tests for older Safari and Chrome versions

DOMPurify 2.5.1

• Fixed an mXSS sanitizer bypass reported by @​icesfont
• Added new code to track element nesting depth
• Added new code to enforce a maximum nesting depth of 255
• Added coverage tests and necessary clobbering protections

Note that this is a security release and should be upgraded to immediately. Please also note that further releases may follow as the underlying vulnerability is apparently new and further variations may be discovered.

DOMPurify 2.5.0

• Added new setting SAFE_FOR_XML to enable better control over comment scrubbing
• Updated the LICENSE file to show the accurate year number
• Updated several build and test dependencies

Commits

• d78f241 chore: Preparing 2.5.6 release
• 38e8410 fix: Added changes to 2.x regarding attribute value checks
• 9a7cd98 See #961
• de2545c chore: Preparing 2.5.5 release
• f1e27e6 chore: Also removed depth counter logic from 2.x branch for now
• 10c1261 docs: Updated README ever so slightly
• 1c92880 test: Fixed two more tests for MSIE11 and Edge 18
• 1401208 test: Fixed more tests for MSIE and Edge 18
• 2c6410a test: Fixed several new tests for MSIE11 and Edge 18
• 2c9bca9 test: Changed github config to include MSIE tests for 2.x
• Additional commits viewable in compare view

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