[Snyk] Security upgrade lazysizes from 4.1.8 to 5.2.1

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Cross-site Scripting (XSS) SNYK-JS-LAZYSIZES-567144	Yes	Proof of Concept

Commit messages

Package name: lazysizes

The new version differs by 71 commits.

• eee2d40 Merge remote-tracking branch 'origin/gh-pages' into gh-pages
• e13530a 5.2.1
• 43cdb48 Merge pull request #781 from Philzen/patch-1
• 3270a0b Fix a typo in README.md
• 60458e6 5.2.1-rc2
• b12ac7f 5.2.1-rc1
• e84ac98 5.2.1-rc1
• 1ce9198 Merge branch 'gh-pages' of https://github.com/aFarkas/lazysizes into gh-pages
• 9803587 Merge pull request #780 from emkayy/amd-for-plugins-umd
• 47909c1 BlurUp-Plugin: Copy style attribute (fixes #746)
• c792554 Built: update dependencies (fixes #774, #756)
• 01d2e52 Merge pull request #779 from emkayy/fix-umd-date
• e2ab14e Build with AMD for plug-ins UMD
• 801016a Added AMD to all plug-ins UMD corresponding to /src/umd.wrapper
• 018b825 Build with Date fix
• 203ddb4 Added missing 'Date' parameter to factory call
• 3720ab8 Video embed: test yt/vimeo id (fixes #764)
• a2f37ec 5.2.0
• a0a0a38 5.2.0-beta1
• 4643216 Merge remote-tracking branch 'origin/gh-pages' into gh-pages
• b15d27c 5.2.0-beta1
• 55f936b Merge pull request #717 from cozzbie/gh-pages
• 780e6d3 refactor window and Date object reference
• 7a7f5d9 Fix Safari Back-Forward Cache issue with lazyloading image elements (fixes #711)

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