Bump webrick from 1.8.1 to 1.8.2

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]

Diff for: Gemfile

@@ -34,4 +34,4 @@ gem "wdm", "~> 0.1.0", :install_if => Gem.win_platform?
 # kramdown v1, comment out this line.
 gem "kramdown-parser-gfm"
 
-gem "webrick", "~> 1.7"
+gem "webrick", "~> 1.8"

Diff for: Gemfile.lock

@@ -254,7 +254,7 @@ GEM
     unf_ext (0.0.8.2)
     unicode-display_width (1.8.0)
     wdm (0.1.1)
-    webrick (1.8.1)
+    webrick (1.8.2)
 
 PLATFORMS
   ruby
@@ -268,7 +268,7 @@ DEPENDENCIES
   tzinfo (~> 2.0)
   tzinfo-data
   wdm (~> 0.1.0)
-  webrick (~> 1.7)
+  webrick (~> 1.8)
 
 BUNDLED WITH
    2.3.7