updating catch to cache2 latest release.

[tinselcity]

What

• fixes for building on 22.04 with gcc/g++ 11.2.0 stock compilers

Error was from older version of catch.hpp

In file included from /usr/include/signal.h:328,
                 from /home/rmorrison/gproj/is2/ext/catch/catch.hpp:6230,
                 from /home/rmorrison/gproj/is2/tests/whitebox/_catch.cc:16:
/home/rmorrison/gproj/is2/ext/catch/catch.hpp:6253:33: error: size of array ‘altStackMem’ is not an integral constant-expression
 6253 |         static char altStackMem[SIGSTKSZ];
      |                                 ^~~~~~~~
/home/rmorrison/gproj/is2/ext/catch/catch.hpp:6304:45: error: size of array ‘altStackMem’ is not an integral constant-expression
 6304 |     char FatalConditionHandler::altStackMem[SIGSTKSZ] = {};
      |                

Described in:
catchorg/Catch2#2178
Seems to be related to glibc change:
https://sourceware.org/git/?p=glibc.git;a=commit;h=6c57d320484988e87e446e2e60ce42816bf51d53

[airencracken]

Did you mean catch2? heh

[airencracken]

lgtm