build: bump Go version to v1.21.0, lnd version to v0.17.0 rc1 (#7914)

* build: update Go version to 1.21.0

* build: bump version to v0.17.0 rc1

build/version.go

@@ -40,14 +40,14 @@ const (
 	AppMajor uint = 0
 
 	// AppMinor defines the minor version of this binary.
-	AppMinor uint = 16
+	AppMinor uint = 17
 
 	// AppPatch defines the application patch for this binary.
-	AppPatch uint = 99
+	AppPatch uint = 0
 
 	// AppPreRelease MUST only contain characters from semanticAlphabet
 	// per the semantic versioning spec.
-	AppPreRelease = "beta"
+	AppPreRelease = "beta.rc1"
 )
 
 func init() {