checkpoint_email: shorten expiry period to avoid expiration races

[efd6]

Proposed commit message

checkpoint_email: shorten expiry period to avoid expiration races

There is a TOCTOU race in the token expiration, so shorten the lifetime
of the token by a small amount to avoid this.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• Ref checkpoint_email: handle 401 on event query by clearing cached token #17829

Screenshots

[elastic-vault-github-plugin-prod]

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cc @efd6

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Pinging @elastic/security-service-integrations (Team:Security-Service Integrations)

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Looks like it doesn't work on forks anymore.

[elastic-vault-github-plugin-prod]

Package checkpoint_email - 1.4.0 containing this change is available at https://epr.elastic.co/package/checkpoint_email/1.4.0/