Updating Catch2 v2 to v2.13.9

[nandanvasudevan]

Fixes issue with MINSIGSTKSZ which is no longer a constant -> https://github.com/catchorg/Catch2/issues/2178

Issue was fixed in https://github.com/catchorg/Catch2/releases/tag/v2.13.5

Does not build in Ubuntu 22.04 with GCC 11.2.0 without this update.

[coveralls]

Pull Request Test Coverage Report for Build 2503282135

• 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 86.037%

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Totals
Change from base Build 2474163658:	0.0%
Covered Lines:	801
Relevant Lines:	931

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💛 - Coveralls

[gummif]

Thanks