Remove support for Python 3.8

.github/workflows/ci.yaml

@@ -14,10 +14,10 @@ jobs:
       fail-fast: false
       matrix:
         platform: [ubuntu-latest, windows-latest]
-        python-version: ["3.8", "3.9"]
+        python-version: ["3.9"]
     runs-on: ${{ matrix.platform }}
     env:
-      IS_MAIN_PYTHON: ${{ matrix.python-version == '3.8' && matrix.platform == 'ubuntu-latest' }}
+      IS_MAIN_PYTHON: ${{ matrix.python-version == '3.9' && matrix.platform == 'ubuntu-latest' }}
     steps:
       - uses: actions/checkout@v4
       - name: Install Python tools

.github/workflows/lint.yml

@@ -7,7 +7,7 @@ on:
       - master
 
 env:
-  PYTHON_VERSION: 3.8
+  PYTHON_VERSION: 3.9
 
 jobs:
   changed-files:
@@ -131,7 +131,7 @@ jobs:
         run: echo "::add-matcher::.github/sphinx-problem-matcher.json"
 
       - name: Build docs
-        run: |
+        run: |-
           poe docs |& tee /tmp/output
           # fail the job if there are issues
           grep -q " WARNING:" /tmp/output && exit 1 || exit 0

CONTRIBUTING.rst

@@ -118,10 +118,10 @@ command. Instead, you can activate the virtual environment in your shell with::
 
     $ poetry shell
 
-You should see ``(beets-py38)`` prefix in your shell prompt. Now you can run
+You should see ``(beets-py3.9)`` prefix in your shell prompt. Now you can run
 commands directly, for example::
 
-    $ (beets-py38) pytest
+    $ (beets-py3.9) pytest
 
 Additionally, `poethepoet`_ task runner assists us with the most common
 operations. Formatting, linting, testing are defined as ``poe`` tasks in

beets/autotag/__init__.py

@@ -14,7 +14,8 @@
 
 """Facilities for automatically determining files' correct metadata."""
 
-from typing import Mapping, Sequence, Union
+from collections.abc import Mapping, Sequence
+from typing import Union
 
 from beets import config, logging
 from beets.library import Album, Item