[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/dev.txt

@@ -1,4 +1,4 @@
-# SHA1:0fe30e8de6a24fe0b1d50d82a23038919d203909
+# SHA1:596eaea6df10023a3db5f9b26c0cf974c97cb86e
 #
 # This file was generated by pip-compile-multi.
 # To update, run:
@@ -7,50 +7,109 @@
 #
 -r test.txt
 application-properties==0.8.3
+    # via pymarkdownlnt
 asttokens==3.0.0
+    # via stack-data
 build==1.2.2.post1
+    # via pip-tools
 certifi==2025.6.15
+    # via requests
 charset-normalizer==3.4.2
-click==8.1.8
+    # via requests
+click==8.2.1
+    # via
+    #   genbadge
+    #   pip-compile-multi
+    #   pip-tools
 columnar==1.4.1
+    # via pymarkdownlnt
 decorator==5.2.1
+    # via ipython
 defusedxml==0.7.1
+    # via genbadge
 django-debug-toolbar==5.2.0
-django-stubs-ext==5.2.1
+    # via -r requirements/dev.in
 django-stubs==5.2.1
+    # via -r requirements/dev.in
+django-stubs-ext==5.2.1
+    # via django-stubs
 executing==2.2.0
+    # via stack-data
 genbadge==1.1.2
+    # via -r requirements/dev.in
 idna==3.10
+    # via requests
+ipython==9.3.0
+    # via -r requirements/dev.in
 ipython-pygments-lexers==1.1.1
-ipython==9.2.0
+    # via ipython
 jedi==0.19.2
+    # via ipython
 markdown-it-py==3.0.0
+    # via rich
 matplotlib-inline==0.1.7
+    # via ipython
 mdurl==0.1.2
+    # via markdown-it-py
 parso==0.8.4
+    # via jedi
 pexpect==4.9.0
+    # via ipython
 pillow==11.2.1
-pip-compile-multi==3.2.1
-pip-tools==7.4.1
+    # via genbadge
 pip==25.1.1
+    # via pip-tools
+pip-compile-multi==3.2.1
+    # via -r requirements/dev.in
+pip-tools==7.4.1
+    # via pip-compile-multi
 prompt-toolkit==3.0.51
+    # via ipython
 ptyprocess==0.7.0
+    # via pexpect
 pure-eval==0.2.3
-pygments==2.19.1
-pymarkdownlnt==0.9.29
+    # via stack-data
+pymarkdownlnt==0.9.30
+    # via -r requirements/dev.in
 pyproject-hooks==1.2.0
+    # via
+    #   build
+    #   pip-tools
+pytest-randomly==3.16.0
+    # via -r requirements/dev.in
 pyyaml==6.0.2
+    # via application-properties
 requests==2.32.4
+    # via genbadge
 rich==14.0.0
+    # via -r requirements/dev.in
 ruff==0.12.0
+    # via -r requirements/dev.in
 setuptools==80.9.0
+    # via
+    #   genbadge
+    #   pip-tools
 stack-data==0.6.3
+    # via ipython
 tomli==2.2.1
+    # via application-properties
 toolz==1.0.0
+    # via columnar
 toposort==1.10
+    # via pip-compile-multi
 traitlets==5.14.3
+    # via
+    #   ipython
+    #   matplotlib-inline
 types-pyyaml==6.0.12.20250516
+    # via django-stubs
 urllib3==2.5.0
+    # via requests
 uv==0.7.13
+    # via -r requirements/dev.in
 wcwidth==0.2.13
+    # via
+    #   columnar
+    #   prompt-toolkit
 wheel==0.45.1
+    # via pip-tools