package/ruby: security bump to version 2.4.9

Fixes the following security vulnerability:

(Bundled jquery)
- CVE-2012-6708: jQuery before 1.9.0 is vulnerable to Cross-site Scripting
  (XSS) attacks.  The jQuery(strInput) function does not differentiate
  selectors from HTML in a reliable fashion.  In vulnerable versions, jQuery
  determined whether the input was HTML by looking for the '<' character
  anywhere in the string, giving attackers more flexibility when attempting
  to construct a malicious payload.  In fixed versions, jQuery only deems
  the input to be HTML if it explicitly starts with the '<' character,
  limiting exploitability only to attackers who can control the beginning of
  a string, which is far less common.

- CVE-2015-9251: jQuery before 3.0.0 is vulnerable to Cross-site Scripting
  (XSS) attacks when a cross-domain Ajax request is performed without the
  dataType option, causing text/javascript responses to be executed.

https://www.ruby-lang.org/en/news/2019/08/28/multiple-jquery-vulnerabilities-in-rdoc/

- CVE-2019-16255: A code injection vulnerability of Shell#[] and Shell#test

https://www.ruby-lang.org/en/news/2019/10/01/code-injection-shell-test-cve-2019-16255/

- CVE-2019-16254: HTTP response splitting in WEBrick (Additional fix)

https://www.ruby-lang.org/en/news/2019/10/01/http-response-splitting-in-webrick-cve-2019-16254/

- CVE-2019-15845: A NUL injection vulnerability of File.fnmatch and File.fnmatch?

https://www.ruby-lang.org/en/news/2019/10/01/nul-injection-file-fnmatch-cve-2019-15845/

- CVE-2019-16201: Regular Expression Denial of Service vulnerability of
  WEBrick's Digest access authentication

https://www.ruby-lang.org/en/news/2019/10/01/webrick-regexp-digestauth-dos-cve-2019-16201/

2.4.9 fixes a packaging bug in 2.4.8:

https://www.ruby-lang.org/en/news/2019/10/02/ruby-2-4-9-released/

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/ruby/ruby.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 RUBY_VERSION_MAJOR = 2.4
-RUBY_VERSION = $(RUBY_VERSION_MAJOR).6
+RUBY_VERSION = $(RUBY_VERSION_MAJOR).9
 RUBY_VERSION_EXT = 2.4.0
 RUBY_SITE = http://cache.ruby-lang.org/pub/ruby/$(RUBY_VERSION_MAJOR)
 RUBY_SOURCE = ruby-$(RUBY_VERSION).tar.xz