Merge pull request #317 from QGIS-Contribution/dependabot/pip/require…

…ments/pytest-qgis-gte-1.3-and-lt-2.1

Update pytest-qgis requirement from <1.4,>=1.3 to >=1.3,<2.1 in /requirements

requirements/testing.txt

@@ -2,5 +2,5 @@
 # --------------------
 
 pytest-cov>=3,<4.2
-pytest-qgis>=1.3,<1.4
+pytest-qgis>=1.3,<2.1
 semver>=2.13,<2.14