Bump webrick from 1.8.1 to 1.8.2 in /docs

Bumps [webrick](https://github.com/ruby/webrick) from 1.8.1 to 1.8.2.
- [Release notes](https://github.com/ruby/webrick/releases)
- [Commits](ruby/webrick@v1.8.1...v1.8.2)

---
updated-dependencies:
- dependency-name: webrick
  dependency-type: direct:production
...

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

Author: dependabot[bot]

docs/Gemfile

@@ -8,4 +8,4 @@ group :jekyll_plugins do
   #gem "jekyll-sass-converter", "~> 1.5.0"
 end
 
-gem "webrick", "~> 1.7"
+gem "webrick", "~> 1.8"

docs/Gemfile.lock

@@ -272,7 +272,7 @@ GEM
       unf_ext
     unf_ext (0.0.8.2)
     unicode-display_width (1.8.0)
-    webrick (1.8.1)
+    webrick (1.8.2)
 
 PLATFORMS
   x86_64-linux
@@ -282,7 +282,7 @@ DEPENDENCIES
   jekyll (= 3.9.4)
   jekyll-theme-slate
   markdown
-  webrick (~> 1.7)
+  webrick (~> 1.8)
 
 BUNDLED WITH
    2.3.22