ci: Update test matrix with new releases (27/10)

Author: alexander-alderman-webb

.github/workflows/test-integrations-agents.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.10","3.11","3.12","3.13","3.14","3.14t"]
+        python-version: ["3.10","3.11","3.12","3.13","3.14","3.14t","3.15","3.15t"]
         os: [ubuntu-22.04]
     env:
       # 3.6/3.7 run in the python:X.Y container; tell uv to use that system Python.

.github/workflows/test-integrations-cloud.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.6","3.7","3.8","3.9","3.10","3.11","3.12","3.13","3.14","3.14t"]
+        python-version: ["3.6","3.7","3.8","3.9","3.10","3.11","3.12","3.13","3.14","3.14t","3.15","3.15t"]
         os: [ubuntu-22.04]
     services:
       docker: