[Snyk] Upgrade contentful from 9.1.4 to 9.1.5

[snyk-bot]

Snyk has created this PR to upgrade contentful from 9.1.4 to 9.1.5.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 1 version ahead of your current version.
• The recommended version was released 2 months ago, on 2021-12-01.

The recommended version fixes:

Severity	Issue	PriorityScore (*)	Exploit Maturity
	Denial of Service (DoS) SNYK-JS-NEXT-2388583	551/1000 Why? Recently disclosed, Has a fix available, CVSS 5.3	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

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[github-actions[bot]]

If all goes well this PR will be deployed and viewable at https://pr-582-dot-staging-dot-celo-org-website.uc.r.appspot.com