chore(deps): update dependency ts-jest to v26.5.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ts-jest (source)	26.5.5 -> 26.5.6

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Release Notes

kulshekhar/ts-jest

v26.5.6

Compare Source

Code Refactoring

• refactor(config): show warning message for sourceMap: false (#​2557) (cf60990).

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Configuration

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[coveralls]

Pull Request Test Coverage Report for Build 820493072

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.754%

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Totals
Change from base Build 810624863:	0.0%
Covered Lines:	489
Relevant Lines:	521

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💛 - Coveralls