PI-2373: Pin tech docs gem version

Author: mxco86

.github/workflows/publish-docs.yml

@@ -45,7 +45,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.1.0
+          ruby-version: 3.1
           bundler-cache: true
           working-directory: tech-docs
       - name: Build Docs

tech-docs/Gemfile

@@ -1,5 +1,4 @@
 source "https://rubygems.org"
-ruby "3.1.0"
 
 # Include the tech docs gem
-gem 'govuk_tech_docs'
+gem 'govuk_tech_docs', '3.5.0'

tech-docs/Gemfile.lock

@@ -42,9 +42,10 @@ GEM
     fast_blank (1.0.1)
     fastimage (2.2.6)
     ffi (1.15.5)
-    govuk_tech_docs (3.3.1)
+    govuk_tech_docs (3.5.0)
       autoprefixer-rails (~> 10.2)
       chronic (~> 0.10.2)
+      haml (< 6.0.0)
       middleman (~> 4.0)
       middleman-autoprefixer (~> 2.10.0)
       middleman-compass (>= 4.0.0)
@@ -125,6 +126,8 @@ GEM
       rouge (~> 3.2)
     minitest (5.18.0)
     multi_json (1.15.0)
+    nokogiri (1.16.5-arm64-darwin)
+      racc (~> 1.4)
     nokogiri (1.16.5-x86_64-linux)
       racc (~> 1.4)
     openapi3_parser (0.9.2)
@@ -168,10 +171,11 @@ GEM
     webrick (1.8.1)
 
 PLATFORMS
+  arm64-darwin-23
   x86_64-linux
 
 DEPENDENCIES
-  govuk_tech_docs
+  govuk_tech_docs (= 3.5.0)
 
 BUNDLED WITH
    2.3.26