development-dependency: bump hashicorp/kubernetes from 2.6.0 to 2.6.1 in /terraform

Bumps hashicorp/kubernetes from 2.6.0 to 2.6.1.

Changelog

Sourced from hashicorp/kubernetes's changelog.

2.6.1 (October 22, 2021)

BUG FIXES:

• Fix import ID syntax in manifest import docs
• Tolerate unknown values in "env" and "exec" provider attributes
• Remove "beta" designation of the kubernetes_manifest from documentation

Commits

• 9497a7b v2.6.1
• 70a277c Update CHANGELOG.md for v2.6.1
• 1740e66 Remove reference to beta status of kubernetes_manifest
• 4e7d1c7 Fix import ID syntax in manifest import docs
• 7eddb95 Check env and exec blocks are fully known
• c85a993 Update manifest.html.markdown
• See full diff in compare view

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