dependency: bump dependabot-omnibus from 0.159.1 to 0.159.2

Bumps dependabot-omnibus from 0.159.1 to 0.159.2.

Changelog

Sourced from dependabot-omnibus's changelog.

v0.159.2, 17 August 2021

• Bump go from 1.16.3 to 1.16.7 #4145
• Handle unreachable go module dependencies in LatestVersionFinder #4142
• Fix failing go modules tests #4141

Commits

• 46237e1 v0.159.2
• ee9dd47 Merge pull request #4145 from dependabot/mctofu/go-1.16.7
• c7a1843 Bump go from 1.16.3 to 1.16.7
• 0c983a1 Merge pull request #4142 from dependabot/mctofu/go-latest-version-unreachable
• 5be8228 Merge pull request #4141 from dependabot/mctofu/go-tests-fix
• 7190943 Handle unreachable dependency error
• 92eb5c9 Use empty instead of bad credentials by default
• 44df6cb Use empty instead of bad credentials as default
• d26bffa Remove github credential test
• 7120593 Relocate github credential test
• Additional commits viewable in compare view

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