Bump external/Catch2 in the generic group across 1 directory

Bumps the generic group with 1 update in the / directory: [external/Catch2](https://github.com/catchorg/Catch2).


Updates `external/Catch2` from `8898cc6` to `506276c`
- [Release notes](https://github.com/catchorg/Catch2/releases)
- [Commits](8898cc6160...506276c592)

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

Signed-off-by: dependabot[bot] <support@github.com>

external/Catch2

@@ -1 +1 @@
-Subproject commit 8898cc61601af6cdd5b4548dd91ccf70ed67f3c2
+Subproject commit 506276c59217429c93abd2fe9507c7f45eb81072