Add missing require for pathname to the sigv4 signer (#3075)

Author: Earlopain

gems/aws-sigv4/CHANGELOG.md

@@ -1,6 +1,8 @@
 Unreleased Changes
 ------------------
 
+* Issue - Add missing require of `pathname` to `Signer`.
+
 1.9.0 (2024-07-23)
 ------------------
 

gems/aws-sigv4/lib/aws-sigv4/signer.rb

@@ -6,6 +6,7 @@
 require 'uri'
 require 'set'
 require 'cgi'
+require 'pathname'
 require 'aws-eventstream'
 
 module Aws