Bump mymindstorm/setup-emsdk from 14 to 15

Bumps [mymindstorm/setup-emsdk](https://github.com/mymindstorm/setup-emsdk) from 14 to 15.
- [Release notes](https://github.com/mymindstorm/setup-emsdk/releases)
- [Commits](emscripten-core/setup-emsdk@v14...v15)

---
updated-dependencies:
- dependency-name: mymindstorm/setup-emsdk
  dependency-version: '15'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/webassembly.yml

@@ -43,7 +43,7 @@ jobs:
           aqtversion: ==3.1.7
 
       - name: Install emsdk
-        uses: mymindstorm/setup-emsdk@v14
+        uses: mymindstorm/setup-emsdk@v15
         with:
           version: 3.1.25
           actions-cache-folder: 'emsdk-cache'