chore(deps): bump TypeSpec dependencies to 1.11.0 in /additions

Consolidates the following Dependabot PRs:
- #1068: @typespec/openapi3 1.10.0 → 1.11.0
- #1069: @typespec/http 1.10.0 → 1.11.0
- #1070: @typespec/compiler 1.10.0 → 1.11.0
- #1071: @typespec/rest 0.80.0 → 0.81.0
- #1072: @typespec/openapi 1.10.0 → 1.11.0

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: ramsessanchez