ci: exclude python 3.7 from elasticsearch 9 tests (#2468)

Author: xrmx

.ci/.matrix_exclude.yml

@@ -40,6 +40,8 @@ exclude:
   # Elasticsearch
   - VERSION: python-3.6
     FRAMEWORK: elasticsearch-9
+  - VERSION: python-3.7
+    FRAMEWORK: elasticsearch-9
   # Flask
   - VERSION: pypy-3
     FRAMEWORK: flask-0.11 # see https://github.com/pallets/flask/commit/6e46d0cd, 0.11.2 was never released