Add uri_parser method for RFC2396 compatibility

This commit introduces a new class method `uri_parser` to handle
URI parsing in a way that's compatible with both newer and older
versions of Ruby's URI library. It checks for the presence of
`URI::RFC2396_PARSER` and falls back to `URI::DEFAULT_PARSER` if
not available, ensuring consistent behavior across different Ruby
versions.

Close caxlsx#397

Ref: ruby/uri#114

lib/axlsx.rb

@@ -33,6 +33,7 @@
 require 'cgi'
 require 'set'
 require 'time'
+require 'uri'
 
 if Gem.loaded_specs.key?("axlsx_styler")
   raise StandardError, "Please remove `axlsx_styler` from your Gemfile, the associated functionality is now built-in to `caxlsx` directly."
@@ -229,4 +230,17 @@ def self.escape_formulas=(value)
     Axlsx.validate_boolean(value)
     @escape_formulas = value
   end
+
+  # Returns a URI parser instance, preferring RFC2396_PARSER if available,
+  # otherwise falling back to DEFAULT_PARSER. This method ensures consistent
+  # URI parsing across different Ruby versions.
+  # Ref: ruby/uri#114
+  def self.uri_parser
+    @uri_parser ||=
+      if defined?(URI::RFC2396_PARSER)
+        URI::RFC2396_PARSER
+      else
+        URI::DEFAULT_PARSER
+      end
+  end
 end

lib/axlsx/drawing/pic.rb

@@ -80,7 +80,7 @@ def hyperlink=(v, options = {})
     def image_src=(v)
       Axlsx.validate_string(v)
       if remote?
-        RegexValidator.validate('Pic.image_src', /\A#{URI::DEFAULT_PARSER.make_regexp}\z/, v)
+        RegexValidator.validate('Pic.image_src', /\A#{Axlsx.uri_parser.make_regexp}\z/, v)
         RestrictionValidator.validate 'Pic.image_src', ALLOWED_MIME_TYPES, MimeTypeUtils.get_mime_type_from_uri(v)
       else
         RestrictionValidator.validate 'Pic.image_src', ALLOWED_MIME_TYPES, MimeTypeUtils.get_mime_type(v)