chore: Update publish-pages action to version 1.0.3 (#244)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> **Low Risk**
> Pins the docs publishing workflow to a newer patch version of an
external GitHub Action; behavioral changes depend on that action but
scope is limited to CI docs deployment.
> 
> **Overview**
> Updates the internal `publish-docs` composite action to use
`launchdarkly/gh-actions/actions/publish-pages` **v1.0.3** instead of
**v1.0.1** when publishing documentation to GitHub Pages.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
dc7f100. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: kinyoklion

.github/actions/publish-docs/action.yml

@@ -11,7 +11,7 @@ inputs:
 runs:
   using: composite
   steps:
-    - uses: launchdarkly/gh-actions/actions/publish-pages@publish-pages-v1.0.1
+    - uses: launchdarkly/gh-actions/actions/publish-pages@publish-pages-v1.0.3
       name: 'Publish to Github pages'
       with:
         docs_path: ${{ inputs.workspace_path }}/docs