Bump addressable from 2.8.1 to 2.9.0 in /docs (#721)

Bumps [addressable](https://github.com/sporkmonger/addressable) from 2.8.1 to 2.9.0.
- [Changelog](https://github.com/sporkmonger/addressable/blob/main/CHANGELOG.md)
- [Commits](sporkmonger/addressable@addressable-2.8.1...addressable-2.9.0)

---
updated-dependencies:
- dependency-name: addressable
  dependency-version: 2.9.0
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docs/Gemfile.lock

@@ -13,8 +13,8 @@ GEM
       minitest (>= 5.1, < 6)
       securerandom (>= 0.3)
       tzinfo (~> 2.0, >= 2.0.5)
-    addressable (2.8.1)
-      public_suffix (>= 2.0.2, < 6.0)
+    addressable (2.9.0)
+      public_suffix (>= 2.0.2, < 8.0)
     base64 (0.3.0)
     benchmark (0.5.0)
     bigdecimal (4.1.0)
@@ -256,7 +256,7 @@ GEM
       sawyer (~> 0.8.0, >= 0.5.3)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (3.1.1)
+    public_suffix (4.0.7)
     racc (1.8.1)
     rake (13.0.1)
     rb-fsevent (0.10.4)