Bump mymindstorm/setup-emsdk from 12 to 13

Bumps [mymindstorm/setup-emsdk](https://github.com/mymindstorm/setup-emsdk) from 12 to 13.
- [Release notes](https://github.com/mymindstorm/setup-emsdk/releases)
- [Commits](https://github.com/mymindstorm/setup-emsdk/compare/v12...v13)

---
updated-dependencies:
- dependency-name: mymindstorm/setup-emsdk
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/on_PR_meson.yaml

@@ -168,7 +168,7 @@ jobs:
         run: |
           python3 -m pip install meson ninja
       - name: Emscripten
-        uses: mymindstorm/setup-emsdk@v12
+        uses: mymindstorm/setup-emsdk@v13
       - name: Compile
         run: |
           meson setup "${{github.workspace}}/build" --cross-file="${{github.workspace}}/em.txt" --wrap-mode=forcefallback -Ddefault_library=static -Dwarning_level=3 -Dcpp_std=c++20 -DunitTests=disabled -Dcurl=disabled