Update qrcode requirement from ~=7.4 to ~=8.0 in /app (#5)

Updates the requirements on [qrcode](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@v7.4...v8.0)

---
updated-dependencies:
- dependency-name: qrcode
  dependency-type: direct:production
...

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app/requirements.txt

@@ -1 +1 @@
-qrcode~=7.4
+qrcode~=8.0