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@6ab9eb1...667eb33)

---
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/continuous_integration.yml

@@ -326,7 +326,7 @@ jobs:
         uses: hendrikmuhs/ccache-action@1bbbcda0748b3e340dee71a314fa68ffcbd6df79 # v1.2.21
         with:
           key: ubuntu-emscripten
-      - uses: mymindstorm/setup-emsdk@6ab9eb1bda2574c4ddb79809fc9247783eaf9021 # v14
+      - uses: mymindstorm/setup-emsdk@667eb33f24e84e7f362c16d8d7fff0629a73e15e # v15
       - name: Update Glslang Sources
         run: ./update_glslang_sources.py
       - name: Configure