🐛 zap-time-encoding test should allow negative tz offset

[JohnStrunk]

The regex used to test whether the times were being properly encoded as ISO8601 only permitted either positive tz offsets or Z. This fix adjusts the regex to also allow negative offsets.

Ref: Wikipedia: ISO 8601 - Time offsets from UTC

Example of failure when running on my local machine:

Zap log level flag options setup
/home/jstrunk/src/controller-runtime/pkg/log/zap/zap_test.go:281
  with zap-time-encoding flag provided
  /home/jstrunk/src/controller-runtime/pkg/log/zap/zap_test.go:487
    Should propagate time encoder to logger [It]
    /home/jstrunk/src/controller-runtime/pkg/log/zap/zap_test.go:529

    Expected
        <string>: 2022-04-05T11:35:03.086-0400
    to match regular expression
        <string>: ^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}.[0-9]{3}(\+[0-9]{4}|Z)

    /home/jstrunk/src/controller-runtime/pkg/log/zap/zap_test.go:546

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[alvaroaleman]

thanks!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, JohnStrunk

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