[CI/Build] Improve mypy + python version matrix (#10041)

Signed-off-by: Russell Bryant <rbryant@redhat.com>

.github/workflows/mypy.yaml

@@ -43,4 +43,4 @@ jobs:
     - name: Mypy
       run: |
         echo "::add-matcher::.github/workflows/matchers/mypy.json"
-        tools/mypy.sh 1
+        tools/mypy.sh 1 ${{ matrix.python-version }}

pyproject.toml

@@ -55,14 +55,12 @@ ignore = [
 ]
 
 [tool.mypy]
-python_version = "3.9"
-
 ignore_missing_imports = true
 check_untyped_defs = true
 follow_imports = "silent"
 
 # After fixing type errors resulting from follow_imports: "skip" -> "silent",
-# move the directory here and remove it from format.sh and mypy.yaml
+# move the directory here and remove it from tools/mypy.sh
 files = [
     "vllm/*.py",
     "vllm/adapter_commons",

tools/mypy.sh

 #!/bin/bash
 
 CI=${1:-0}
+PYTHON_VERSION=${2:-3.9}
 
 if [ $CI -eq 1 ]; then
     set -e
@@ -9,10 +10,10 @@ fi
 run_mypy() {
     echo "Running mypy on $1"
     if [ $CI -eq 1 ] && [ -z "$1" ]; then
-        mypy "$@"
+        mypy --python-version "${PYTHON_VERSION}" "$@"
         return
     fi
-    mypy --follow-imports skip "$@"
+    mypy --follow-imports skip --python-version "${PYTHON_VERSION}" "$@"
 }
 
 run_mypy # Note that this is less strict than CI