Update dependency dnspython to v2.7.0 (#1942)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [dnspython](https://redirect.github.com/rthalley/dnspython) | minor |
`==2.6.1` -> `==2.7.0` |

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> Some dependencies could not be looked up. Check the Dependency
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### Release Notes

<details>
<summary>rthalley/dnspython (dnspython)</summary>

###
[`v2.7.0`](https://redirect.github.com/rthalley/dnspython/releases/tag/v2.7.0):
dnspython 2.7.0

[Compare
Source](https://redirect.github.com/rthalley/dnspython/compare/v2.6.1...v2.7.0)

See [What's
New](https://dnspython.readthedocs.io/en/stable/whatsnew.html) for
details.

The minimum supported version of Python is 3.9.

My thanks to the many people who have contributed to this release. Also
thanks to my co-maintainers: Tomáš Křížek, Petr Špaček, and Brian
Wellington.

</details>

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aws-ts-stackreference-architecture/application/src/backend/requirements.txt

@@ -1,5 +1,5 @@
 Click==7.0
-dnspython==2.6.1
+dnspython==2.7.0
 Flask==2.3.3
 itsdangerous==0.24
 Jinja2==3.1.5