build: bump version to v0.16.0-rc5

Because a tag for RC4 was previously pushed but without bumping the
version first, we need to skip RC4 as we can't replace already pushed
git tags without causing issues.

build/version.go

@@ -47,7 +47,7 @@ const (
 
 	// AppPreRelease MUST only contain characters from semanticAlphabet
 	// per the semantic versioning spec.
-	AppPreRelease = "beta.rc3"
+	AppPreRelease = "beta.rc5"
 )
 
 func init() {