build(deps): bump idna in /samples/bookinfo/src/productpage (#620)

Bumps [idna](https://github.com/kjd/idna) from 2.8 to 3.7.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v2.8...v3.7)

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

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

Author: dependabot[bot]

samples/bookinfo/src/productpage/requirements.txt

@@ -10,7 +10,7 @@ future==0.17.1
 futures==3.1.1
 gevent==23.9.1
 greenlet==0.4.15
-idna==2.8
+idna==3.7
 itsdangerous==1.1.0
 jaeger-client==3.13.0
 Jinja2==3.1.3