chore(deps): update homebrew formula ibm/spnl to v0.15.0

Author: renovate[bot]

Formula/spnl.rb

@@ -6,8 +6,8 @@ class Spnl < Formula
 
   on_macos do
     on_arm do
-      url "https://github.com/IBM/spnl/releases/download/v0.14.3/spnl-v0.14.3-macos-aarch64.tar.gz"
-      sha256 "98e9618a6e605159f980ecd8d87a9868484615383c91458cd10d0697feda8069"
+      url "https://github.com/IBM/spnl/archive/refs/tags/v0.15.0.tar.gz"
+      sha256 "53f317cc3e05c4443fa7b4262b57518f0a0f65f9c0cbe5467bd12b3c7a92eec8"
     end
   end