CI: (lint) ubuntu-24.04, check pyproject (#455)

Author: dmitry-lipetsk

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ on:
 
 jobs:
   lint:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     strategy:
       fail-fast: false
       matrix:
@@ -33,13 +33,16 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install flake8 flake8-pyproject ruff==0.15.22
+        python -m pip install flake8 flake8-pyproject ruff==0.15.22 validate-pyproject[all]
     - name: Lint with flake8
       run: |
         flake8 .
     - name: Lint with ruff
       run: |
         ruff check .
+    - name: Check pyproject
+      run: |
+        validate-pyproject pyproject.toml
 
   build-check:
     runs-on: ubuntu-latest