Update module github.com/bufbuild/buf to v1.50.1

Author: renovate[bot]

go.mod

@@ -5,7 +5,7 @@ go 1.20
 require (
 	github.com/Masterminds/semver v1.5.0
 	github.com/alecthomas/kong v0.8.0
-	github.com/bufbuild/buf v1.26.1
+	github.com/bufbuild/buf v1.50.1
 	github.com/crossplane/crossplane-runtime v1.13.0
 	github.com/cyphar/filepath-securejoin v0.2.4
 	github.com/google/go-cmp v0.5.9