Merge pull request matplotlib#25615 from QuLogic/skip-broken-nbconvert

TST: Avoid broken nbconvert

Author: ksunden

environment.yml

@@ -49,7 +49,7 @@ dependencies:
   - flake8-docstrings>=1.4.0
   - gtk4
   - ipykernel
-  - nbconvert[execute]!=6.0.0,!=6.0.1
+  - nbconvert[execute]!=6.0.0,!=6.0.1,!=7.3.0
   - nbformat!=5.0.0,!=5.0.1
   - pandas!=0.25.0
   - psutil

requirements/testing/extra.txt

@@ -2,7 +2,7 @@
 
 --prefer-binary
 ipykernel
-nbconvert[execute]!=6.0.0,!=6.0.1
+nbconvert[execute]!=6.0.0,!=6.0.1,!=7.3.0
 nbformat!=5.0.0,!=5.0.1
 pandas!=0.25.0
 pikepdf