[EventHubs] sanitize api version from avro recordings (Azure#28215)

pipelines are failing when running non-live tests, b/c of strange pip install issues (i.e. installing diff versions of azure-schemaregistry for diff OSes). Scrubbing api-version altogether to avoid failures.

Author: swathipil

sdk/schemaregistry/azure-schemaregistry-avroencoder/assets.json

@@ -2,5 +2,5 @@
   "AssetsRepo": "Azure/azure-sdk-assets",
   "AssetsRepoPrefixPath": "python",
   "TagPrefix": "python/schemaregistry/azure-schemaregistry-avroencoder",
-  "Tag": "python/schemaregistry/azure-schemaregistry-avroencoder_b8297fb102"
+  "Tag": "python/schemaregistry/azure-schemaregistry-avroencoder_5561f5215a"
 }

sdk/schemaregistry/azure-schemaregistry-avroencoder/conftest.py

@@ -4,6 +4,7 @@
 # autouse=True will trigger this fixture on each pytest run, even if it's not explicitly used by a test method
 @pytest.fixture(scope="session", autouse=True)
 def add_sanitizers(test_proxy):
+    add_general_regex_sanitizer(regex="(?<=api-version=)[0-9]{4}-[0-9]{2}", value="xxxx-xx")
     add_general_regex_sanitizer(regex="(?<=\\/\\/)[a-z-]+(?=\\.servicebus\\.windows\\.net)", value="fake_resource_avro")
     add_oauth_response_sanitizer()