[main] (deps): Bump src/submodules/spa-templates (#45069)

Bumps [src/submodules/spa-templates](https://github.com/dotnet/spa-templates) from `57bf5a0` to `8c9078b`.
- [Release notes](https://github.com/dotnet/spa-templates/releases)
- [Commits](dotnet/spa-templates@57bf5a0...8c9078b)

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

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