[main] (deps): Bump src/submodules/spa-templates (#39577)
[main] (deps): Bump src/submodules/spa-templates (#39577)

Bumps [src/submodules/spa-templates](https://github.com/dotnet/spa-templates) from `fc3ec49` to `a50a863`.
- [Release notes](https://github.com/dotnet/spa-templates/releases)
- [Commits](https://github.com/dotnet/spa-templates/compare/fc3ec4900d35dd00058e45aec6fbc8034696c5e5...a50a863d1567c73afd8a2913490e0ec48f99e559)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore