Update chefstyle requirement from 1.5.9 to 1.6.1

[dependabot-preview]

Updates the requirements on chefstyle to permit the latest version.

Changelog

Sourced from chefstyle's changelog.

v1.6.1 (2021-01-28)

Merged Pull Requests

• Update RuboCop to 1.8.1 #122 (tas50)
• Add a cop for detecting legacy powershell methods #123 (tas50)
• Update to RuboCop 1.9 #125 (tas50)

v1.5.9 (2020-12-30)

Merged Pull Requests

• Update to RuboCop 1.7 #121 (tas50)

v1.5.8 (2020-12-21)

Merged Pull Requests

• Update to RuboCop 1.6.1 #119 (tas50)

v1.5.7 (2020-12-04)

Merged Pull Requests

• Update to RuboCop 1.5.2 #118 (tas50)

v1.5.6 (2020-12-01)

Merged Pull Requests

• Update to Rubocop 1.4.1 #114 (tas50)
• Allow 1 line defs w/o a space between #115 (tas50)
• Update RuboCop engine to 1.4.2 #116 (tas50)
• Update RuboCop to 1.5.0 #117 (tas50)

v1.5.2 (2020-11-16)

Merged Pull Requests

• Update RuboCop to 1.3.1 #113 (tas50)

v1.5.1 (2020-11-12)

Merged Pull Requests

• Upgrade to RuboCop 1.3.0 #112 (tas50)

v1.5.0 (2020-11-05)

Merged Pull Requests

• Update to RuboCop 1.2 #110 (tas50)
• Enable new cops #111 (tas50)

v1.4.5 (2020-10-12)

Merged Pull Requests

... (truncated)

Commits

• e6ece06 Bump version to 1.6.1 by Chef Expeditor
• d76de82 Merge pull request #125 from chef/1.9
• b4beec5 Vendor rubocop-1.9.0 upstream configuration.
• cd9960d Update RuboCop to 1.9.0
• b5cb2d3 Bump version to 1.6.0 by Chef Expeditor
• 988a247 Merge pull request #123 from chef/powershell
• b6eb708 Add the newline for phil
• db9b123 Add a cop for detecting legacy powershell methods
• ec9ab06 Bump version to 1.5.10 by Chef Expeditor
• 17a2664 Merge pull request #122 from chef/1.8.1
• Additional commits viewable in compare view

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