Bump TCGC to 0.67.3 for http-client-csharp (#10515)

Bumps `@azure-tools/typespec-client-generator-core` from `0.67.2` to <a
href="https://github.com/Azure/typespec-azure/blob/main/packages/typespec-client-generator-core/CHANGELOG.md#0673">`0.67.3`</a>
in the `http-client-csharp` package.

- **`packages/http-client-csharp/package.json`**
- `@azure-tools/typespec-client-generator-core` devDependency: `0.67.2`
→ `0.67.3`
- `@azure-tools/typespec-client-generator-core` peerDependency lower
bound: `>=0.67.1` → `>=0.67.3` (range now `>=0.67.3 <0.68.0 ||
~0.68.0-0`)
- `@azure-tools/typespec-azure-core`: `0.67.0` → `0.67.1` — required by
the new TCGC peer constraint `^0.67.1`
- **`packages/http-client-csharp/package-lock.json`**: regenerated via
`npm install`
- Reran `eng/scripts/Generate.ps1`; produced no diff in generated output

Other `@typespec/*` peers (`compiler`, `http`, `openapi`, `rest`, `sse`,
`streams`, `versioning`, `xml`, `events`) are already satisfied by
existing version ranges and required no changes. No changeset is added,
consistent with prior TCGC bump PRs (#10309, #10368).

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: jorgerangel-msft <102122018+jorgerangel-msft@users.noreply.github.com>

Author: Copilot

packages/http-client-csharp/package-lock.json

@@ -57,7 +57,7 @@
     "emitter/lib/*.tsp"
   ],
   "peerDependencies": {
-    "@azure-tools/typespec-client-generator-core": ">=0.67.1 <0.68.0 || ~0.68.0-0",
+    "@azure-tools/typespec-client-generator-core": ">=0.67.3 <0.68.0 || ~0.68.0-0",
     "@typespec/compiler": "^1.11.0",
     "@typespec/http": "^1.11.0",
     "@typespec/openapi": "^1.11.0",
@@ -68,8 +68,8 @@
   },
   "devDependencies": {
     "@azure-tools/azure-http-specs": "0.1.0-alpha.39",
-    "@azure-tools/typespec-azure-core": "0.67.0",
-    "@azure-tools/typespec-client-generator-core": "0.67.2",
+    "@azure-tools/typespec-azure-core": "0.67.1",
+    "@azure-tools/typespec-client-generator-core": "0.67.3",
     "@microsoft/api-extractor": "^7.52.2",
     "@types/node": "~22.12.0",
     "@typespec/compiler": "1.11.0",