Bump keras from 3.10.0 to 3.11.3 in /demos (#1566)

Bumps [keras](https://github.com/keras-team/keras) from 3.10.0 to 3.11.3.
- [Release notes](https://github.com/keras-team/keras/releases)
- [Commits](https://github.com/keras-team/keras/commits)

---
updated-dependencies:
- dependency-name: keras
  dependency-version: 3.11.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

demos/imagetagger/requirements.txt

@@ -1,6 +1,6 @@
 aiohttp==3.12.15
 aiohttp-jinja2==1.6
-keras==3.10.0
+keras==3.11.3
 Pillow==11.3.0
 tensorflow==2.20.0
 trafaret_config==2.0.2