Add a test with up to date dependencies & fix zarr-python v2 (#2973)

* Test with latest dependencies

* Update job name

* Add pytest-timeout

* Add numcodecs pin

* Install msgpack python

Author: dstansby

Diff for: .github/workflows/latest-deps.yml

@@ -0,0 +1,30 @@
+# This workflow simulates a fresh environment where the only install
+# command is a user pip installing zarr
+name: Latest dependencies
+
+on:
+  push:
+    branches: [ support/v2 ]
+  pull_request:
+    branches: [ support/v2 ]
+
+jobs:
+  latest-deps:
+
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Setup Miniconda
+      uses: conda-incubator/[email protected]
+      with:
+          auto-update-conda: true
+          python-version: "3.12"
+    - name: Tests
+      shell: bash -el {0}
+      env:
+        ZARR_V3_EXPERIMENTAL_API: 1
+        ZARR_V3_SHARDING: 1
+      run: |
+        python -m pip install pytest pytest-cov pytest-timeout msgpack-python
+        python -m pip install .
+        pytest -svx --timeout=300

Diff for: docs/release.rst

@@ -16,16 +16,24 @@ Release notes
 .. note::
    Zarr-Python 2 is in support mode now, and no new features will be added.
 
-.. _release_2.18.6:
+.. _release_2.18.7:
 
-2.18.6
+2.18.7
 ------
 
 Fixes
 ~~~~~
 * Pinned ``numcodecs`` to ``<0.16``. In ``numcodecs`` 0.16 deprecated code was removed
-  that makes it incompatible with zarr-python 2.18.
-  By :user:`David Stansby <dstansby>` (:issue:`2965`)
+  that makes it incompatible with older versions of zarr-python 2.18.
+  By :user:`David Stansby <dstansby>` (:issue:`2973`)
+
+.. _release_2.18.6:
+
+2.18.6
+------
+Note: the numcodecs dependency pin was incorrectly applied in this release, meaning it maintains
+the same issue with numcodecs compatibility as previous releases. Please upgrade
+to 2.18.7 to fix this.
 
 .. _release_2.18.5:
 

Diff for: pyproject.toml

@@ -13,7 +13,7 @@ dependencies = [
     'asciitree',
     'numpy>=1.24',
     'fasteners; sys_platform != "emscripten"',
-    'numcodecs>=0.10.0,!=0.14.0,!=0.14.1',
+    'numcodecs>=0.10.0,!=0.14.0,!=0.14.1,<0.16',
 ]
 dynamic = ["version"]
 classifiers = [