[deps] add pytest-randomly to run tests in random order

ATM it is intended for use in dev env, not test env.

On test/ci we want a more reproducable order (...I think).

requirements/test.txt

@@ -7,13 +7,29 @@
 #
 -r prod.txt
 attrs==25.3.0
+    # via hypothesis
 coverage==7.9.1
+    # via pytest-cov
 hypothesis==6.135.14
+    # via -r requirements/test.in
 iniconfig==2.1.0
+    # via pytest
 packaging==25.0
+    # via pytest
 pluggy==1.6.0
+    # via
+    #   pytest
+    #   pytest-cov
 pygments==2.19.1
-pytest-cov==6.2.1
-pytest-django==4.11.1
+    # via pytest
 pytest==8.4.1
+    # via
+    #   -r requirements/test.in
+    #   pytest-cov
+    #   pytest-django
+pytest-cov==6.2.1
+    # via -r requirements/test.in
+pytest-django==4.11.1
+    # via -r requirements/test.in
 sortedcontainers==2.4.0
+    # via hypothesis