build(deps): bump idna from 3.3 to 3.7 in /docs

Bumps [idna](https://github.com/kjd/idna) from 3.3 to 3.7.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v3.3...v3.7)

---
updated-dependencies:
- dependency-name: idna
  dependency-type: indirect
...

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

docs/requirements.txt

@@ -16,7 +16,7 @@ docutils==0.17.1
     # via
     #   sphinx
     #   sphinx-rtd-theme
-idna==3.3
+idna==3.7
     # via requests
 imagesize==1.4.1
     # via sphinx
@@ -38,10 +38,10 @@ snowballstemmer==2.2.0
     # via sphinx
 sphinx==5.0.2
     # via
-    #   -r docs/requirements.in
+    #   -r requirements.in
     #   sphinx-rtd-theme
 sphinx-rtd-theme==1.0.0
-    # via -r docs/requirements.in
+    # via -r requirements.in
 sphinxcontrib-applehelp==1.0.2
     # via sphinx
 sphinxcontrib-devhelp==1.0.2