Use Ruby 3.0.5 as the default

ashmckenzie · ashmckenzie · commit d27c94764c6a · 2023-01-10T11:59:58.000+11:00
diff --git a/.ruby-version b/.ruby-version
@@ -1 +1 @@
-2.7.7
+3.0.5
diff --git a/.tool-versions b/.tool-versions
@@ -1,2 +1,2 @@
-ruby 2.7.7
+ruby 3.0.5
 golang 1.18.7
