fix: remove duplicate rake and nokogiri deps from Gemfile

rake and nokogiri are declared in both the Gemfile and gemspec with
different version constraints. This causes all Dependabot bundler PRs
to fail CI because Dependabot's Bundler serializes merged
Gemfile+gemspec constraints into the lockfile DEPENDENCIES section,
while CI's Bundler (in frozen mode) expects only the Gemfile
constraints and flags the mismatch.

Remove the duplicate entries from the Gemfile so each gem has a single
source of truth for its constraint (the gemspec). This eliminates the
serialization mismatch regardless of Bundler version.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Signed-off-by: Zack Koppert <zkoppert@github.com>

Author: zkoppert

Gemfile

@@ -13,6 +13,4 @@ gem "creole", "~>0.5.0"
 gem "wikicloth", "=0.8.3"
 gem "twitter-text", "~> 1.14"
 gem "asciidoctor", "~> 2.0.26"
-gem "rake"
 gem "rexml"
-gem "nokogiri", "~> 1.19"

Gemfile.lock

@@ -126,10 +126,10 @@ DEPENDENCIES
   html-pipeline (~> 1.0)
   kramdown
   minitest (~> 5.4, >= 5.4.3)
-  nokogiri (~> 1.19)
+  nokogiri (~> 1.19.2)
   nokogiri-diff (~> 0.3.0)
   org-ruby (= 0.9.12)
-  rake
+  rake (~> 13)
   rdoc (~> 6.13.1)
   redcarpet
   rexml