Bump faker from 40.11.1 to 40.12.0 in /demos (#1795)

Bumps [faker](https://github.com/joke2k/faker) from 40.11.1 to 40.12.0.
- [Release notes](https://github.com/joke2k/faker/releases)
- [Changelog](https://github.com/joke2k/faker/blob/master/CHANGELOG.md)
- [Commits](joke2k/faker@v40.11.1...v40.12.0)

---
updated-dependencies:
- dependency-name: faker
  dependency-version: 40.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

demos/chat/requirements.txt

@@ -1,3 +1,3 @@
 aiohttp==3.13.4
 aiohttp-jinja2==1.6
-faker==40.11.1
+faker==40.12.0

demos/graphql-demo/requirements-dev.txt

@@ -2,7 +2,7 @@ aiohttp==3.13.4
 aiohttp-jinja2==1.6
 aiohttp-graphql==1.1.0
 aiodataloader==0.4.3
-faker==40.11.1
+faker==40.12.0
 trafaret_config==2.0.2
 graphene==2.1.9
 graphql-core==2.3.2

demos/motortwit/requirements.txt

@@ -2,7 +2,7 @@ aiohttp==3.13.4
 aiohttp-jinja2==1.6
 aiohttp-security==0.5.0
 bcrypt==5.0.0
-faker==40.11.1
+faker==40.12.0
 motor==3.7.1
 pytz==2026.1.post1
 pyyaml==6.0.3