Update dependency rdoc to v6.15.0

Author: renovate[bot]

Gemfile.lock

@@ -38,6 +38,7 @@ GEM
     date (3.4.1)
     diff-lcs (1.6.2)
     docile (1.4.1)
+    erb (5.0.2)
     ffi (1.17.2-arm64-darwin)
     ffi (1.17.2-x64-mingw-ucrt)
     ffi (1.17.2-x86_64-linux-gnu)
@@ -58,8 +59,10 @@ GEM
     racc (1.8.1)
     rainbow (3.1.1)
     rake (13.2.1)
-    rdoc (6.13.1)
+    rdoc (6.15.0)
+      erb
       psych (>= 4.0.0)
+      tsort
     regexp_parser (2.10.0)
     rubocop (1.75.5)
       json (~> 2.3)
@@ -86,9 +89,6 @@ GEM
     rubocop-rake (0.7.1)
       lint_roller (~> 1.1)
       rubocop (>= 1.72.1)
-    rubocop-rspec (3.6.0)
-      lint_roller (~> 1.1)
-      rubocop (~> 1.72, >= 1.72.1)
     ruby-progressbar (1.13.0)
     simplecov (0.22.0)
       docile (~> 1.1)
@@ -100,6 +100,7 @@ GEM
     stringio (3.1.7)
     sys-uname (1.3.1)
       ffi (~> 1.1)
+    tsort (0.2.0)
     unicode-display_width (3.1.4)
       unicode-emoji (~> 4.0, >= 4.0.4)
     unicode-emoji (4.0.4)
@@ -118,10 +119,9 @@ DEPENDENCIES
   rake (~> 13.2)
   rdoc (~> 6.7)
   rubocop (~> 1.52)
-  rubocop-minitest (> 0)
-  rubocop-performance (> 0)
-  rubocop-rake (> 0)
-  rubocop-rspec (> 0)
+  rubocop-minitest (~> 0.38)
+  rubocop-performance (~> 1.25)
+  rubocop-rake (~> 0.7)
   simplecov (~> 0.22)
 
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