Update PyLint to v3 for compatibility with Python 3.12.

 This necessitates dropping Python 3.7 from the CI/CD pipeline, though using the library is still supported. Only PyLint no longer works.

.github/workflows/lint-test-docs.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "pypy3.7", "pypy3.8", "pypy3.9", "pypy3.10"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy3.7", "pypy3.8", "pypy3.9", "pypy3.10"]
 
     steps:
       - uses: actions/checkout@v3

pyproject.toml

@@ -21,7 +21,7 @@ repository = "https://github.com/frederickjansen/polyline"
 dev = [
     "pytest~=7.0",
     "pytest-cov~=4.0",
-    "pylint~=2.15.10",
+    "pylint~=3.0.3",
     "sphinx~=5.3.0",
     "sphinx-rtd-theme~=1.2.0",
     "toml~=0.10.2",