chore(deps): update module github.com/cenkalti/backoff/v4 to v6

Signed-off-by: red-hat-konflux-kflux-prd-rh03 <206760901+red-hat-konflux-kflux-prd-rh03[bot]@users.noreply.github.com>

Author: red-hat-konflux-kflux-prd-rh03[bot]

go.mod

@@ -23,7 +23,7 @@ require (
 	github.com/aymerick/douceur v0.2.0 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/blang/semver/v4 v4.0.0 // indirect
-	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
+	github.com/cenkalti/backoff/v6 v6.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/emicklei/go-restful/v3 v3.13.0 // indirect