build(deps): bump walkdir from 2.2.8 to 2.2.9

Bumps [walkdir](https://github.com/BurntSushi/walkdir) from 2.2.8 to 2.2.9.
- [Release notes](https://github.com/BurntSushi/walkdir/releases)
- [Commits](BurntSushi/walkdir@2.2.8...2.2.9)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

Cargo.lock

@@ -23,7 +23,7 @@ uuid = { version = "0.7.4", features = ["v4"] }
 
 [dev-dependencies]
 graph-mock = { path = "../mock" }
-walkdir = "2.2.8"
+walkdir = "2.2.9"
 test-store = { path = "../store/test-store" }
 hex = "0.3.2"
 graphql-parser = "0.2.1"