Build(deps): Bump rdoc from 6.14.2 to 6.15.0 (#35193)

Bumps [rdoc](https://github.com/ruby/rdoc) from 6.14.2 to 6.15.0.
- [Release notes](https://github.com/ruby/rdoc/releases)
- [Changelog](https://github.com/ruby/rdoc/blob/master/History.rdoc)
- [Commits](https://github.com/ruby/rdoc/compare/v6.14.2...v6.15.0)

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

Gemfile.lock

@@ -484,9 +484,10 @@ GEM
       msgpack (>= 0.4.3)
       optimist (>= 3.0.0)
     rchardet (1.10.0)
-    rdoc (6.14.2)
+    rdoc (6.15.0)
       erb
       psych (>= 4.0.0)
+      tsort
     redcarpet (3.6.1)
     redis (5.4.0)
       redis-client (>= 0.22.0)
@@ -1126,7 +1127,7 @@ CHECKSUMS
   rbs (3.9.5) sha256=eabaaf60aee84e38cbf94839c6e1b9cd145c7295fc3cc0e88c92e4069b1119b0
   rbtrace (0.5.2) sha256=a2d7d222ab81363aaa0e91337ddbf70df834885d401a80ea0339d86c71f31895
   rchardet (1.10.0) sha256=d5ea2ed61a720a220f1914778208e718a0c7ed2a484b6d357ba695aa7001390f
-  rdoc (6.14.2) sha256=9fdd44df130f856ae70cc9a264dfd659b9b40de369b16581f4ab746e42439226
+  rdoc (6.15.0) sha256=0f0e68864969e77c2acd4063a9585baa5216d362701d827a93feaa9cbae78b05
   redcarpet (3.6.1) sha256=d444910e6aa55480c6bcdc0cdb057626e8a32c054c29e793fa642ba2f155f445
   redis (5.4.0) sha256=798900d869418a9fc3977f916578375b45c38247a556b61d58cba6bb02f7d06b
   redis-client (0.26.1) sha256=1e39d2862c4516a75ff777ee6ed08827af39336bfece4a48e944244891d9a073