Backport of [deps] Update consul-template dependency into release/1.2.x

[hc-github-team-nomad-core]

Backport

This PR is auto-generated from #15045 to be assessed for backporting due to the inclusion of the label backport/1.2.x.

WARNING automatic cherry-pick of commits failed. Commits will require human attention.

The below text is copied from the body of the original PR.

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Updates consul-template to hashicorp/consul-template@90370e0

Fixes #14768

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[tgross]

Closing because this can't be backported currently b/c this CT version has 1.4.x Nomad API features.

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