Automated PR for harmonizer release 2.9.1 (#596)

not actually automated, but the title will kick off the publish

Co-authored-by: clenfest <[email protected]>

Author: clenfest

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "harmonizer"
-version = "2.9.0"
+version = "2.9.1"
 authors = ["Apollo <[email protected]>"]
 edition = "2018"
 description = "Apollo Federation utility to compose a supergraph from subgraphs"