[stable/concourse] Fix typo in Vault cert paths.

[madmod]

The paths for certs in /concourse-vault were using the extension crt instead of the expected extension cert which caused the pod to fail with an error.

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[madmod]

I signed the CLA.

[unguiculus]

cc @frodenas @viglesiasce @william-tran @nexeck

[william-tran]

Looks fine by me. FYI I have a PR #3254 that makes breaking changes to the keys used for vault configuration, in a wider effort to avoid having your secrets in helm. I don't use Vault, so I'd appreciate an extra set of eyes. I'm in the middle of updating the docs as it's still referencing some old keys, but all the code is stable.

[madmod]

@william-tran I have reviewed the Vault specific aspects of your PR. Thanks!

[unguiculus]

/ok-to-test

[unguiculus]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: madmod, unguiculus

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