Read version from VERSION file in gemspec

Make ruby-plsql.gemspec read s.version from the VERSION file instead
of hardcoding it. This way only the VERSION file needs to be updated
when releasing a new version of ruby-plsql.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: yahonda

ruby-plsql.gemspec

@@ -1,13 +1,8 @@
-# Generated by juwelier
-# DO NOT EDIT THIS FILE DIRECTLY
-# Instead, edit Juwelier::Tasks in Rakefile, and run 'rake gemspec'
 # -*- encoding: utf-8 -*-
 
-# stub: ruby-plsql 0.8.0 ruby lib
-
 Gem::Specification.new do |s|
   s.name = "ruby-plsql".freeze
-  s.version = "0.8.0"
+  s.version = File.read(File.expand_path("VERSION", __dir__)).chomp
 
   s.required_rubygems_version = Gem::Requirement.new(">= 0".freeze) if s.respond_to? :required_rubygems_version=
   s.require_paths = ["lib".freeze]