Bump external/Catch2 from `0631b60` to `9131736` (#2576)

Bumps [external/Catch2](https://github.com/catchorg/Catch2) from `0631b60` to `9131736`.
- [Release notes](https://github.com/catchorg/Catch2/releases)
- [Commits](0631b607ee...9131736630)

---
updated-dependencies:
- dependency-name: external/Catch2
  dependency-type: direct:production
...

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external/Catch2

@@ -1 +1 @@
-Subproject commit 0631b607ee2bbc07c7c238f0b15b23ef21926960
+Subproject commit 91317366304dc6b29a6ebc9670c703192e9f4f42