replace nbsphinx with myst-nb (#4200)

Author: valeriupredoi

environment.yml

@@ -29,7 +29,7 @@ dependencies:
   - fire
   - fsspec
   - gdal >=3.9.0
-  - ipython <9.0  # github.com/ESMValGroup/ESMValCore/issues/2680 ; remove ipython when solved
+  - ipython
   - iris >=3.11
   - iris-esmf-regrid >=0.10.0  # github.com/SciTools-incubator/iris-esmf-regrid/pull/342
   - jinja2
@@ -79,7 +79,7 @@ dependencies:
   - pytest-xdist
   # Python packages needed for building docs
   - autodocsumm >=0.2.2
-  - nbsphinx
+  - myst-nb
   - sphinx >=6.1.3
   - pydata-sphinx-theme
   # Python packages needed for development

environment_osx.yml

@@ -29,7 +29,7 @@ dependencies:
   - fire
   - fsspec
   - gdal >=3.9.0
-  - ipython <9.0  # github.com/ESMValGroup/ESMValCore/issues/2680 ; remove ipython when solved
+  - ipython
   - iris >=3.11
   - iris-esmf-regrid >=0.10.0  # github.com/SciTools-incubator/iris-esmf-regrid/pull/342
   - jinja2
@@ -79,7 +79,7 @@ dependencies:
   - pytest-xdist
   # Python packages needed for building docs
   - autodocsumm >=0.2.2
-  - nbsphinx
+  - myst-nb
   - sphinx >=6.1.3
   - pydata-sphinx-theme
   # Python packages needed for development

pyproject.toml

@@ -52,7 +52,7 @@ dependencies = [
     "fire",
     "fsspec",
     "GDAL",
-    "ipython<9.0",  # github.com/ESMValGroup/ESMValCore/issues/2680
+    "ipython",
     "jinja2",
     "joblib",
     "lime",
@@ -106,7 +106,7 @@ test = [
 ]
 doc = [
     "autodocsumm>=0.2.2",
-    "nbsphinx",
+    "myst-nb",
     "sphinx>=6.1.3",
     "pydata_sphinx_theme",
 ]