chore(deps): Update qrcode[pil] requirement from ~=6.1 to ~=7.4 in /demo

Updates the requirements on [qrcode[pil]](https://github.com/lincolnloop/python-qrcode) to permit the latest version.
- [Changelog](https://github.com/lincolnloop/python-qrcode/blob/main/CHANGES.rst)
- [Commits](lincolnloop/python-qrcode@v6.1...v7.4.2)

---
updated-dependencies:
- dependency-name: qrcode[pil]
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

demo/requirements.txt

@@ -2,4 +2,4 @@ asyncpg~=0.26.0
 prompt_toolkit~=2.0.9
 web.py~=0.62
 pygments~=2.10
-qrcode[pil]~=6.1
+qrcode[pil]~=7.4