fix(deps): update module github.com/sirupsen/logrus to v1.8.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/sirupsen/logrus	require	minor	v1.4.2 -> v1.8.1

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Release Notes

sirupsen/logrus

v1.8.1

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v1.8.0

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Correct versioning number replacing v1.7.1

v1.7.1

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Code quality:

• use go 1.15 in travis
• use magefile as task runner

Fixes:

• small fixes about new go 1.13 error formatting system
• Fix for long time race condiction with mutating data hooks

Features:

• build support for zos

v1.7.0

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• a new buffer pool management API has been added
• a set of <LogLevel>Fn() functions have been added
• the dependency toward a windows terminal library has been removed

v1.6.0

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Release v1.6.0

v1.5.0

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This new release introduces:

• Ability to DisableHTMLEscape when using the JSON formatter: https://github.com/sirupsen/logrus/pull/524
• Support/fixes for go 1.14
• Many many bugfixes

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