Bump idna from 3.4 to 3.7 in /requirements

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>

requirements/doc-spelling.txt

@@ -22,7 +22,7 @@ docutils==0.20.1
     # via sphinx
 funcparserlib==1.0.1
     # via blockdiag
-idna==3.4
+idna==3.7
     # via requests
 imagesize==1.4.1
     # via sphinx
@@ -95,6 +95,4 @@ zipp==3.17.0
 
 # The following packages are considered to be unsafe in a requirements file:
 setuptools==68.0.0
-    # via
-    #   blockdiag
-    #   sphinx
+    # via blockdiag

requirements/doc.txt

@@ -22,7 +22,7 @@ docutils==0.20.1
     # via sphinx
 funcparserlib==1.0.1
     # via blockdiag
-idna==3.4
+idna==3.7
     # via requests
 imagesize==1.4.1
     # via sphinx
@@ -90,6 +90,4 @@ zipp==3.17.0
 
 # The following packages are considered to be unsafe in a requirements file:
 setuptools==68.0.0
-    # via
-    #   blockdiag
-    #   sphinx
+    # via blockdiag