Modernise CI: Python versions, action versions, Dependabot

.github/dependabot.yml

@@ -0,0 +1,24 @@
+version: 2
+updates:
+  # Picks up requirements.txt and requirements-dev.txt.
+  - package-ecosystem: pip
+    directory: /
+    schedule:
+      interval: weekly
+    ignore:
+      # Deliberately unpinned and kept current on the server by a daily timer
+      # (deploy/update-ytdlp.sh). Its floor only moves when YouTube requires a
+      # newer build, which is a judgement no weekly bump can make.
+      - dependency-name: yt-dlp
+      # Capped below 1.6 by discord.py 2.7.1; see requirements.txt.
+      - dependency-name: PyNaCl
+        versions: [">=1.6"]
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      # One PR for all action bumps rather than one per action.
+      actions:
+        patterns: ["*"]

.github/workflows/tests.yml

@@ -10,19 +10,48 @@ on:
 permissions:
   contents: read
 
+# A new push to a PR makes the run for the previous one pointless.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+
+      - uses: actions/setup-python@v7
+        with:
+          python-version: "3.12"
+          cache: pip
+
+      - name: Install dependencies
+        run: pip install -r requirements-dev.txt
+
+      - name: Lint
+        # Correctness rules only (see ruff.toml): an undefined name in a
+        # rarely-run branch otherwise surfaces as a crash in production.
+        run: ruff check .
+
+      - name: Type check
+        # Every function must be annotated (see mypy.ini).
+        run: mypy
+
   pytest:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         # 3.12 is what Ubuntu 24.04 ships, which is what the bot is deployed on.
-        python-version: ["3.11", "3.12"]
+        # 3.14 is the newest release, so a dependency that breaks on it shows
+        # up here rather than on the next OS upgrade.
+        python-version: ["3.12", "3.14"]
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v7
         with:
           python-version: ${{ matrix.python-version }}
           cache: pip
@@ -37,18 +66,7 @@ jobs:
           ffmpeg -version | head -1
 
       - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install -r requirements-dev.txt
-
-      - name: Lint
-        # Correctness rules only (see ruff.toml): an undefined name in a
-        # rarely-run branch otherwise surfaces as a crash in production.
-        run: ruff check .
-
-      - name: Type check
-        # Every function must be annotated (see mypy.ini).
-        run: mypy
+        run: pip install -r requirements-dev.txt
 
       - name: Run tests
         # The suite needs no credentials, no network and no .env.

README.md

@@ -93,7 +93,7 @@ No installation required — the bot is hosted and always online.
 ## 🛠️ Self-hosting
 
 ### Requirements
-- Python 3.11+
+- Python 3.12+
 - FFmpeg on your PATH
 - A Discord bot token with the **Message Content** intent enabled — the only
   privileged intent the bot asks for
@@ -131,7 +131,7 @@ filters, since a wrong filter string looks perfectly reasonable and only shows u
 as the wrong playback speed. Those skip automatically if FFmpeg is not installed.
 
 CI runs the lint, the type check and the tests on every push and pull request,
-against Python 3.11 and 3.12.
+with the tests running on Python 3.12 (what the server runs) and 3.14 (the newest).
 
 ### Deploy to a server
 See **[deploy/README.md](deploy/README.md)** for the full walkthrough:

mypy.ini

@@ -1,5 +1,5 @@
 [mypy]
-python_version = 3.11
+python_version = 3.12
 files = main.py, config.py, cogs, services, utils
 # The project is a set of top-level packages rather than one installed package.
 explicit_package_bases = True

ruff.toml

@@ -1,4 +1,4 @@
-target-version = "py311"
+target-version = "py312"
 
 [lint]
 # Correctness only: undefined names, unused imports and variables, syntax