Update compatibility mimetype to not use internal version number

Author: JoshMock

elasticsearch_serverless/_sync/client/_base.py

@@ -42,9 +42,7 @@
 from .utils import _base64_auth_header, _quote_query
 
 _WARNING_RE = re.compile(r"\"([^\"]*)\"")
-_COMPAT_MIMETYPE_TEMPLATE = "application/vnd.elasticsearch+%s; compatible-with=" + str(
-    __versionstr__.partition(".")[0]
-)
+_COMPAT_MIMETYPE_TEMPLATE = "application/vnd.elasticsearch+%s; compatible-with=8"
 _COMPAT_MIMETYPE_RE = re.compile(r"application/(json|x-ndjson|vnd\.mapbox-vector-tile)")
 _COMPAT_MIMETYPE_SUB = _COMPAT_MIMETYPE_TEMPLATE % (r"\g<1>",)