Drop python 3.8 and numpy 1.20

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -27,7 +27,7 @@ body:
     attributes:
       label: Python Version
       description: Version of Python interpreter
-      placeholder: 3.8.5, 3.9, 3.10, etc.
+      placeholder: 3.9, 3.10, 3.11, etc.
     validations:
       required: true
   - type: input

.github/workflows/python-package.yml

@@ -15,13 +15,13 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11']
-        numpy_version: ['>=1.22.0', '==1.20.*']
+        python-version: ['3.9', '3.10', '3.11']
+        numpy_version: ['>=1.22.0', '==1.21.*']
         exclude:
           - python-version: '3.10'
-            numpy_version: '==1.20.*'
+            numpy_version: '==1.21.*'
           - python-version: '3.11'
-            numpy_version: '==1.20.*'
+            numpy_version: '==1.21.*'
     services:
       redis:
         image: redis

.github/workflows/releases.yml

@@ -19,7 +19,7 @@ jobs:
       - uses: actions/setup-python@v4.7.1
         name: Install Python
         with:
-          python-version: '3.8'
+          python-version: '3.9'
 
       - name: Install PyBuild
         run: |

.github/workflows/windows-testing.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: True
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.9', '3.10', '3.11']
     steps:
       - uses: actions/checkout@v4
         with:

environment.yml

@@ -4,7 +4,7 @@ channels:
 dependencies:
   - wheel
   - numcodecs >= 0.6.4
-  - numpy >= 1.20
+  - numpy >= 1.21
   - pip
   - pip:
     - asciitree

pyproject.toml

@@ -10,10 +10,10 @@ readme = { file = "README.md", content-type = "text/markdown" }
 maintainers = [
     { name = "Alistair Miles", email = "alimanfoo@googlemail.com" }
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dependencies = [
     'asciitree',
-    'numpy>=1.20,!=1.21.0',
+    'numpy>=1.21.1',
     'fasteners',
     'numcodecs>=0.10.0',
 ]
@@ -30,7 +30,6 @@ classifiers = [
     'Topic :: Software Development :: Libraries :: Python Modules',
     'Operating System :: Unix',
     'Programming Language :: Python :: 3',
-    'Programming Language :: Python :: 3.8',
     'Programming Language :: Python :: 3.9',
     'Programming Language :: Python :: 3.10',
     'Programming Language :: Python :: 3.11',
@@ -119,7 +118,7 @@ exclude = '''
 '''
 
 [tool.mypy]
-python_version = "3.8"
+python_version = "3.9"
 ignore_missing_imports = true
 follow_imports = "silent"