Set Sphinx minimum version to 7.0.0

Author: sadielbartholomew

cf/__init__.py

@@ -122,7 +122,7 @@
 else:
     # Check the version of cfdm
     _minimum_vn = "1.12.2.0"
-    _maximum_vn = "1.12.3.0"
+    _maximum_vn = "1.12.10.0"
     _cfdm_version = Version(cfdm.__version__)
     if _cfdm_version < Version(_minimum_vn) or _cfdm_version >= Version(
         _maximum_vn

release_docs

@@ -10,11 +10,9 @@ fi
 
 version=`python -c "import cf; print(cf.__version__)"`
 
+
 sphinx_version=`python -c "import sphinx; print(sphinx.__version__)"`
-if [[ $sphinx_version != "2.4.5"  ]] ; then
-  echo "ERROR: Must (sadly) use sphinx version 2.4.5. Got $sphinx_version"
-  exit 3
-fi
+echo "NOTE: Using sphinx version: $sphinx_version"
 
 if [[ $1 = "latest" ]] ; then 
   dir=$PWD/docs

setup.py

@@ -251,7 +251,7 @@ def compile():
     "convolution filters, derivatives, relative vorticity": ["scipy>=1.1.0"],
     "subspacing with multi-dimensional construct cells": ["matplotlib>=3.0.0"],
     "documentation": [
-        "sphinx==2.4.5",
+        "sphinx>=7.0.0",
         "sphinx-copybutton",
         "sphinx-toggleprompt",
         "sphinxcontrib-spelling",