Mk/bsd.default-versions.mk: Switch default version of Ruby from 2.7 to 3.0

How to upgrade is described in the entry of 20220421 in UPDATING.

PR:		262350
Exp-run by:	antoine

Mk/bsd.default-versions.mk

@@ -116,7 +116,7 @@ PYTHON2_DEFAULT?=	2.7
 # Possible values: 3.7, 3.8, 3.9, 3.10, 3.11
 PYTHON3_DEFAULT?=	3.8
 # Possible values: 2.7, 3.0, 3.1, 3.2
-RUBY_DEFAULT?=		2.7
+RUBY_DEFAULT?=		3.0
 # Possible values: rust, rust-nightly
 RUST_DEFAULT?=		rust
 # Possible values: 4.12, 4.13

UPDATING

@@ -5,6 +5,30 @@ they are unavoidable.
 You should get into the habit of checking this file for changes each time
 you update your ports collection, before attempting any port upgrades.
 
+20220421:
+  AFFECTS: users of lang/ruby27
+  AUTHOR: yasu@FreeBSD.org
+
+  The default ruby version has been updated from 2.7 to 3.0.
+
+  If you compile your own ports you may keep 2.7 as the default version by
+  adding the following lines to your /etc/make.conf file:
+
+  #
+  # Keep ruby 2.7 as default version
+  #
+  DEFAULT_VERSIONS+=ruby=2.7
+
+  If you wish to update to the new default version, you need to first stop any
+  software that uses ruby. Then, you will need to follow these steps, depending
+  upon how you manage your system.
+
+  If you use pkg, simply upgrade:
+  # pkg upgrade
+
+  If you do not use pkg, please check entry 20190420.
+  The description there should also work for this version.
+
 20220413:
   AFFECTS: users of net-im/py-matrix-synapse
   AUTHOR: ports@skyforge.at