Bump idna from 3.4 to 3.7 in /docs

Bumps [idna](https://github.com/kjd/idna) from 3.4 to 3.7.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v3.4...v3.7)

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

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

docs/requirements.txt

@@ -6,8 +6,6 @@
 #
 alabaster==0.7.13
     # via sphinx
-appnope==0.1.3
-    # via ipython
 astropy==5.3.4
     # via -r requirements.in
 asttokens==2.4.1
@@ -52,17 +50,17 @@ executing==2.0.1
     # via stack-data
 fastjsonschema==2.18.1
     # via nbformat
-h5py
+h5py==3.11.0
     # via -r requirements.in
-idna==3.4
+idna==3.7
     # via requests
 imagesize==1.4.1
     # via sphinx
 ipython==8.16.1
     # via -r requirements.in
 jedi==0.19.1
     # via ipython
-jinja2>=3.1.3
+jinja2==3.1.3
     # via
     #   myst-parser
     #   nbconvert