[DOC] Update required baseruby version

Author: nobu

doc/contributing/building_ruby.md

@@ -17,7 +17,7 @@
     * [autoconf] - 2.67 or later
     * [gperf] - 3.1 or later
         * Usually unneeded; only if you edit some source files using gperf
-    * ruby - 3.0 or later
+    * ruby - 3.1 or later
         * We can upgrade this version to system ruby version of the latest
           Ubuntu LTS.
     * git - 2.32 or later

doc/windows.md

@@ -122,7 +122,7 @@ sh ../../ruby/configure -C --disable-install-doc --with-opt-dir=C:\Users\usernam
 
 4.  If you want to build from GIT source, following commands are required.
     * `git`
-    * `ruby` 3.0 or later
+    * `ruby` 3.1 or later
 
     You can use [scoop](https://scoop.sh/) to install them like: