[Snyk] Security upgrade next from 12.3.7 to 15.5.10

[leovuk]

Snyk has created this PR to fix 1 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• examples/cms-buttercms/package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Allocation of Resources Without Limits or Throttling SNYK-JS-NEXT-15104645	696

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🦉 Allocation of Resources Without Limits or Throttling