Bump addressable from 2.7.0 to 2.8.0 in /docs

Bumps [addressable](https://github.com/sporkmonger/addressable) from 2.7.0 to 2.8.0.
- [Release notes](https://github.com/sporkmonger/addressable/releases)
- [Changelog](https://github.com/sporkmonger/addressable/blob/main/CHANGELOG.md)
- [Commits](https://github.com/sporkmonger/addressable/compare/addressable-2.7.0...addressable-2.8.0)

---
updated-dependencies:
- dependency-name: addressable
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

docs/Gemfile.lock

@@ -7,7 +7,7 @@ GEM
       minitest (~> 5.1)
       tzinfo (~> 1.1)
       zeitwerk (~> 2.2, >= 2.2.2)
-    addressable (2.7.0)
+    addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
     coffee-script (2.4.1)
       coffee-script-source
@@ -24,6 +24,7 @@ GEM
       http_parser.rb (~> 0.6.0)
     ethon (0.12.0)
       ffi (>= 1.3.0)
+    eventmachine (1.2.7)
     eventmachine (1.2.7-x64-mingw32)
     execjs (2.7.0)
     faraday (1.3.0)
@@ -31,6 +32,7 @@ GEM
       multipart-post (>= 1.2, < 3)
       ruby2_keywords
     faraday-net_http (1.0.1)
+    ffi (1.14.2)
     ffi (1.14.2-x64-mingw32)
     forwardable-extended (2.6.0)
     gemoji (3.0.1)
@@ -217,6 +219,8 @@ GEM
     multipart-post (2.1.1)
     nokogiri (1.11.1-x64-mingw32)
       racc (~> 1.4)
+    nokogiri (1.11.1-x86_64-linux)
+      racc (~> 1.4)
     octokit (4.20.0)
       faraday (>= 0.9)
       sawyer (~> 0.8.0, >= 0.5.3)
@@ -257,13 +261,14 @@ GEM
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.7)
+    unf_ext (0.0.7.7-x64-mingw32)
     unicode-display_width (1.7.0)
-    wdm (0.1.1)
     webrick (1.7.0)
     zeitwerk (2.4.2)
 
 PLATFORMS
   x64-mingw32
+  x86_64-linux
 
 DEPENDENCIES
   activesupport (>= 4.1.11)
@@ -272,7 +277,6 @@ DEPENDENCIES
   just-the-docs (~> 0.3)
   rouge (~> 3.26)
   tzinfo-data
-  wdm (~> 0.1)
   webrick (~> 1.7)
 
 BUNDLED WITH