Elastic APM is oss (open-telemetry#4756)

Co-authored-by: Severin Neumann <[email protected]>

Author: shalk

data/ecosystem/vendors.yaml

@@ -100,7 +100,7 @@
   nativeOTLP: true
   url: https://www.elastic.co/guide/en/apm/get-started/current/open-telemetry-elastic.html
   contact:
-  oss: false
+  oss: true
   commercial: true
 - name: F5
   nativeOTLP: true