chore(deps): update terraform nomad to v1.4.20

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
nomad (source)	required_provider	patch	1.4.17 -> 1.4.20

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Release Notes

hashicorp/terraform-provider-nomad (nomad)

v1.4.20

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IMPROVEMENTS:

• Target Nomad 1.5.2: updated the nomad client to support Nomad API, jobspec, and features of version 1.5.2 (#​305)
• New Resource: nomad_acl_auth_method manages ACL auth methods in Nomad (#​305)
• New Resource: nomad_acl_binding_rule manages ACL binding rules in Nomad (#​305)

v1.4.19

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IMPROVEMENTS:

• Target Nomad 1.4.1: updated the nomad client to support Nomad API, jobspec, and fetures of version 1.4.1 (#​291)
• New Resource: nomad_acl_role manages ACL roles in Nomad (#​284)
• New Data Source: nomad_acl_role and nomad_acl_roles retrieves and lists ACL roles (#​284)

IMPROVEMENTS:

• resources/nomad_acl_token: add support for role and expiration_ttl (#​286)
• resources/nomad_namespace: add support for meta and capabilities (#​287)
• data source/nomad_namespace: add support for meta and capabilities (#​287)

v1.4.18

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• Target Nomad 1.3.4: updated the nomad client to support Nomad API and jobspec version 1.3.4 (#​282)

IMPROVEMENTS:

• provider: add ignore_env_vars configuration to allow specifying environment variables that should not be loaded by the provider. (#​281)
• provider: ignore NOMAD_NAMESPACE and NOMAD_REGION when running in Terraform Cloud by default. (#​281)

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