Upgrade nokogiri to 1.16.5 to address CVE-2024-34459

This upgrade is not critical, because it addresses and xmllint issue
and nokogiri doesn't expose xmllint to us.

Fixes https://github.com/github/licensed/security/dependabot/11

.licenses/bundler/nokogiri.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: nokogiri
-version: 1.15.6
+version: 1.16.5
 type: bundler
 summary: Nokogiri (鋸) makes it easy and painless to work with XML and HTML from Ruby.
 homepage: https://nokogiri.org

Gemfile.lock

@@ -54,7 +54,7 @@ GEM
     mocha (2.4.5)
       ruby2_keywords (>= 0.0.5)
     mutex_m (0.2.0)
-    nokogiri (1.15.6)
+    nokogiri (1.16.5)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     octokit (6.1.0)