Merge pull request #4024 from Unidata/dependabot-pip-ci-dev-pytest-mpl-0.19.0

CI: (deps): Bump pytest-mpl from 0.18.0 to 0.19.0 in /ci-dev

Author: dopplershift

ci-dev/test_requirements.txt

@@ -1,5 +1,5 @@
 packaging==26.0
 pytest==9.0.0
-pytest-mpl==0.18.0
+pytest-mpl==0.19.0
 coverage==7.13.0
 vcrpy==8.1.0