v2.13.8

--- Fixes ---
* Made `Approx::operator()` const (#2288)
* Improved pkg-config files (#2284)
* Fixed warning suppression leaking out of Catch2 when compiled with clang.exe (#2280)
* The macro-generated names for things like `TEST_CASE` no longer create reserved identifiers (#2336)

--- Improvements ---
* Clang-tidy should no longer warn about missing virtual dispatch in `FilterGenerator`'s constructor (#2314)
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