Add Linux wheels for 3.13, drop 3.6.

Author: termim

.github/workflows/test_linux.yml

@@ -33,7 +33,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ['3.6', '3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
         os: [ubuntu-20.04]
 
     services:

dev/build_manylinux_wheels.sh

@@ -58,7 +58,7 @@ git config --global --add safe.directory /pymssql
     --static-freetds
 
 # Install Python dependencies and compile wheels
-PYTHONS="cp36-cp36m cp37-cp37m cp38-cp38 cp39-cp39 cp310-cp310 cp311-cp311 cp312-cp312"
+PYTHONS="cp37-cp37m cp38-cp38 cp39-cp39 cp310-cp310 cp311-cp311 cp312-cp312 cp313-cp313"
 for i in $PYTHONS; do
     PYBIN="/opt/python/$i/bin"
     if  [ -d ${PYBIN} ] ; then

setup.py

@@ -324,7 +324,6 @@ def mk_long_description(numrev=1):
       "Intended Audience :: Developers",
       "License :: OSI Approved :: GNU Library or Lesser General Public License (LGPL)",
       "Programming Language :: Python",
-      "Programming Language :: Python :: 3.6",
       "Programming Language :: Python :: 3.7",
       "Programming Language :: Python :: 3.8",
       "Programming Language :: Python :: 3.9",