Update dependency nexmo to v2.4.1

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This PR contains the following updates:

Package	Type	Update	Change
nexmo	dependencies	patch	2.4.0 -> 2.4.1

By merging this PR, the issue #16 will be automatically resolved and closed:

Severity	CVSS Score	CVE
Critical	9.8	CVE-2021-3918
Medium	5.6	CVE-2020-15366

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Release Notes

nexmo/nexmo-node (nexmo)

v2.4.1

Compare Source

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• If you want to rebase/retry this PR, check this box

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⚠ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: package-lock.json

No /opt/buildpack/tools/npm/6.14.18/bin defined - aborting