mri: build 3.x rubies with ruby 3.4.1

Because of this error while building ruby 2.7.8:

    /usr/local/rake-compiler/sources/ruby-2.7.8/lib/delegate.rb:44:in 'Module#undef_method': undefined method '=~' for module '#<Module:0x00007bf99fa388f0>' (NameError)

Author: flavorjones

Dockerfile.mri.erb

@@ -115,7 +115,7 @@ RUN sudo mkdir -p /usr/local/rake-compiler && \
 xrubies_build_plan = if platform =~ /x64-mingw-ucrt/
   [
     # Rubyinstaller-3.1+ is platform x64-mingw-ucrt
-    ["3.4.1:3.3.5:3.2.6:3.1.6", "3.1.6"],
+    ["3.4.1:3.3.5:3.2.6:3.1.6", "3.4.1"],
   ]
 elsif platform =~ /x64-mingw32/
   [
@@ -126,7 +126,8 @@ elsif platform =~ /x64-mingw32/
 else
   [
     ["2.6.10:2.5.9:2.4.10", "2.5.9"],
-    ["3.4.1:3.3.5:3.2.6:3.1.6:3.0.7:2.7.8", "3.1.6"],
+    ["2.7.8", "3.1.6"],
+    ["3.4.1:3.3.5:3.2.6:3.1.6:3.0.7", "3.4.1"],
   ]
 end