chore(deps): bump idna from 3.10 to 3.15

Bumps [idna](https://github.com/kjd/idna) from 3.10 to 3.15.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.md)
- [Commits](kjd/idna@v3.10...v3.15)

---
updated-dependencies:
- dependency-name: idna
  dependency-version: '3.15'
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements-dev.txt

@@ -81,7 +81,7 @@ flask-marshmallow==1.5.0
     # via apiflask
 html5rdf==1.2.1
     # via rdflib
-idna==3.18
+idna==3.15
     # via
     #   email-validator
     #   requests

requirements.txt

@@ -71,7 +71,7 @@ flask-marshmallow==1.3.0
     # via apiflask
 html5rdf==1.2.1
     # via rdflib
-idna==3.10
+idna==3.15
     # via
     #   email-validator
     #   requests