Merge pull request #256 from Guts/dependabot/pip/requirements/myst-pa…

…rser-linkify--gte-0.14-and-lt-2.1

Update myst-parser[linkify] requirement from <0.16,>=0.14 to >=0.14,<2.1 in /requirements

requirements/documentation.txt

@@ -1,7 +1,7 @@
 # Documentation (for devs)
 # -----------------------
 
-myst-parser[linkify]>=0.14,<0.16
+myst-parser[linkify]>=0.14,<2.1
 sphinx-autobuild==2021.3.14
 sphinx-autodoc-typehints>=1.11,<1.13
 sphinx-copybutton<1