[release/6.0] (deps): Bump src/submodules/spa-templates (#36482)

Bumps [src/submodules/spa-templates](https://github.com/dotnet/spa-templates) from `796e436` to `a64c11d`.
- [Release notes](https://github.com/dotnet/spa-templates/releases)
- [Commits](https://github.com/dotnet/spa-templates/compare/796e4363976fbd719468dc9466aa333ae82f7ae3...a64c11d4919e91f52ae042b58be2b2c346f27a39

)

---
updated-dependencies:
- dependency-name: src/submodules/spa-templates
  dependency-type: direct:production
...

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