[BUGFIX beta] Ensure locals do not clobber components of the same name

[rwjblue]

Updates glimmer-vm to include glimmerjs/glimmer-vm#1253.

Fixes #19334

[chancancode]

Do we need a test?

I think basically:

1. register a component called foo (e.g. template: "foo component")
2. have a block param called |foo| (e.g. a string literal "foo block param")
3. Invoke <Foo /> inside the block (should render "foo component" instead of "foo block param")

[rwjblue]

Ya, good call. Added the test now.