Use older python versions for macos actions (#4601)

Use python versions that have a darwin/arm64 build for use with the newer
(faster) macos actions runners

Author: masenf

.github/workflows/integration_tests.yml

@@ -201,7 +201,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.11.11", "3.12.8"]
+        # Note: py311 version chosen due to available arm64 darwin builds.
+        python-version: ["3.11.9", "3.12.8"]
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v4

.github/workflows/unit_tests.yml

@@ -92,8 +92,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # Note: py39, py310 versions chosen due to available arm64 darwin builds.
-        python-version: ["3.9.21", "3.10.16", "3.11.11", "3.12.8", "3.13.1"]
+        # Note: py39, py310, py311 versions chosen due to available arm64 darwin builds.
+        python-version: ["3.9.13", "3.10.11", "3.11.9", "3.12.8", "3.13.1"]
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v4