chore(deps): update buildkite plugin nienbo/cache to v2.4.20

[pactflow-renovate-bot]

This PR contains the following updates:

Package	Update	Change
nienbo/cache	patch	v2.4.15 -> v2.4.20

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Release Notes

nienbo/cache-buildkite-plugin (nienbo/cache)

v2.4.20

Compare Source

• create save-cache-dir if not exists when uploading. See #​81 by @​calvinbui
  • Fixes regression from #​78.

v2.4.19

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• upload to s3 without local path. See #​80 by @​calvinbui
  • Fixes regression from #​76.

v2.4.18

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• create cache-dir if not exists. See #​78 by @​calvinbui
• Ability to skip uploading cache. See #​79 by @​calvinbui

v2.4.17

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• Fix typos and update readme. See #​77 by @​calvinbui
• configurable save-cache directory. See #​75 by @​calvinbui
• Don't upload to S3 if local cache exists. See #​76 by @​calvinbui
• fix #​72 ignore corrupted save-cache. See #​73 by @​eshedg

v2.4.16

Compare Source

• Add date formats to templates. See #​71 by @​pquerna

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