Bump nokogiri from 1.10.10 to 1.11.4 (#70)

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.10.10 to 1.11.4.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.10.10...v1.11.4)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -25,16 +25,17 @@ GEM
     concurrent-ruby (1.1.7)
     css_parser (1.7.1)
       addressable
-    gepub (1.0.11)
-      nokogiri (>= 1.8.2, < 1.11)
-      rubyzip (> 1.1.1, < 2.3)
+    gepub (1.0.13)
+      nokogiri (>= 1.8.2, < 1.12)
+      rubyzip (> 1.1.1, < 2.4)
     hashery (2.1.2)
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2020.0512)
-    mini_portile2 (2.4.0)
-    nokogiri (1.10.10)
-      mini_portile2 (~> 2.4.0)
+    mini_portile2 (2.5.1)
+    nokogiri (1.11.4)
+      mini_portile2 (~> 2.5.0)
+      racc (~> 1.4)
     pdf-core (0.7.0)
     pdf-reader (2.4.0)
       Ascii85 (~> 1.0.0)
@@ -57,9 +58,10 @@ GEM
       pdf-reader (~> 2.0)
       prawn (~> 2.2)
     public_suffix (4.0.5)
+    racc (1.5.2)
     rouge (3.22.0)
     ruby-rc4 (0.1.5)
-    rubyzip (2.2.0)
+    rubyzip (2.3.0)
     safe_yaml (1.0.5)
     thread_safe (0.3.6)
     treetop (1.6.10)