Bump emitter version (#38657)

Bumps emitter-related dependencies to their latest versions and
regenerates the lock file.

### Changes
- **`eng/emitter-package.json`**: Updated versions:
  - `@azure-tools/openai-typespec`: `1.15.0` → `1.17.0`
  - `@azure-tools/typespec-client-generator-core`: `0.68.0` → `0.68.2`
  - `@azure-tools/typespec-ts`: `0.53.2` → `0.53.3`
- **`eng/emitter-package-lock.json`**: Regenerated via `tsp-client
generate-lock-file`
- **`.scripts/automation_generate.sh`**: Bumped `@autorest/typescript`
from `^6.0.72` → `^6.0.73`

### Packages impacted by this PR

`eng/emitter-package.json`, `eng/emitter-package-lock.json`,
`.scripts/automation_generate.sh`

### Issues associated with this PR


### Describe the problem that is addressed by this PR

Emitter dependencies were pinned to outdated versions. This PR brings
them up to the latest available releases.

### What are the possible designs available to address the problem? If
there are more than one possible design, why was the one in this PR
chosen?

N/A — straightforward version bumps following the standard process:
update `emitter-package.json`, regenerate lock file with `tsp-client
generate-lock-file`, update `automation_generate.sh`.

### Are there test cases added in this PR? _(If not, why?)_

No — version bump only; no logic changes.

### Provide a list of related PRs _(if any)_


### Checklists
- [ ] Added impacted package name to the issue description.
- [ ] Does this PR need any fixes in the SDK Generator?** _(If so,
create an Issue in the
[Autorest/typescript](https://github.com/Azure/autorest.typescript)
repository and link it here.)_
- [ ] Added a changelog (if necessary).

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: v-jiaodi <80496810+v-jiaodi@users.noreply.github.com>
Co-authored-by: Jiao Di (MSFT) <v-jiaodi@microsoft.com>

Author: Copilot

.scripts/automation_generate.sh

@@ -1,2 +1,2 @@
 #!/usr/bin/env bash
-npm --prefix eng/tools/js-sdk-release-tools exec --no -- code-gen-pipeline --inputJsonPath=$1 --outputJsonPath=$2 --use=@autorest/typescript@^6.0.72 --typespecEmitter=@azure-tools/typespec-ts
+npm --prefix eng/tools/js-sdk-release-tools exec --no -- code-gen-pipeline --inputJsonPath=$1 --outputJsonPath=$2 --use=@autorest/typescript@^6.0.73 --typespecEmitter=@azure-tools/typespec-ts

eng/emitter-package-lock.json

@@ -2,15 +2,15 @@
   "name": "typescript-emitter-package",
   "main": "dist/src/index.js",
   "dependencies": {
-    "@azure-tools/openai-typespec": "1.15.0",
+    "@azure-tools/openai-typespec": "1.17.0",
     "@typespec/events": "0.82.0",
     "@typespec/openapi": "1.12.0",
     "@typespec/openapi3": "1.12.0",
     "@typespec/streams": "0.82.0",
-    "@azure-tools/typespec-ts": "0.53.2",
+    "@azure-tools/typespec-ts": "0.53.3",
     "@azure-tools/typespec-azure-core": "0.68.0",
     "@azure-tools/typespec-autorest": "0.68.0",
-    "@azure-tools/typespec-client-generator-core": "0.68.0",
+    "@azure-tools/typespec-client-generator-core": "0.68.2",
     "@azure-tools/typespec-azure-resource-manager": "0.68.0",
     "@azure-tools/typespec-azure-rulesets": "0.68.0",
     "@azure-tools/typespec-liftr-base": "0.14.0",