lang: unregister and remove expired lang/ruby27

Bump example version from 2.7 to 3.1 which is the default version.

MOVED

@@ -17908,3 +17908,4 @@ textproc/rubygem-loofah218|textproc/rubygem-loofah|2023-04-09|Remove obsoleted p
 textproc/rubygem-rouge329|textproc/rubygem-rouge|2023-04-09|Remove obsoleted port. Use textproc/rubygem-rouge instead
 www/rubygem-erubi19|www/rubygem-erubi|2023-04-09|Remove obsoleted port. Use www/rubygem-erubi instead
 multimedia/mythtv-frontend|multimedia/mythtv|2023-04-10|Frontend is no part of multimedia/mythtv
+lang/ruby27|lang/ruby30|2023-04-13|Please migrate to newer versions. Ruby 2.7 will reach its EoL on April 12, 2023

Mk/Uses/ruby.mk

@@ -15,7 +15,7 @@
 # [variables that a user may define]
 #
 # RUBY_VER		- (See below)
-# RUBY_DEFAULT_VER	- Set to (e.g.) "2.7" if you want to refer to "ruby27"
+# RUBY_DEFAULT_VER	- Set to (e.g.) "3.1" if you want to refer to "ruby31"
 #			  just as "ruby".
 # RUBY_ARCH		- (See below)
 #
@@ -144,14 +144,7 @@ RUBY?=			${LOCALBASE}/bin/ruby${RUBY_SUFFIX}
 .    if defined(RUBY_VER)
 # When adding a version, please keep the comment in
 # Mk/bsd.default-versions.mk in sync.
-.      if ${RUBY_VER} == 2.7
-#
-# Ruby 2.7
-#
-RUBY_DISTVERSION=	2.7.7
-RUBY_PORTREVISION=	0
-
-.      elif ${RUBY_VER} == 3.0
+.      if ${RUBY_VER} == 3.0
 #
 # Ruby 3.0
 #
@@ -177,7 +170,7 @@ RUBY_PORTREVISION=	0
 #
 # Other versions
 #
-IGNORE=	Only ruby 2.7, 3.0, 3.1 and 3.2 are supported
+IGNORE=	Only ruby 3.0, 3.1 and 3.2 are supported
 _INVALID_RUBY_VER=	1
 .      endif
 RUBY_PORTEPOCH=		1
@@ -186,7 +179,6 @@ RUBY_VERSION=	${RUBY_DISTVERSION:C/^([0-9]+\.[0-9]+\.[0-9]+).*/\1/}
 
 .    if !defined(_INVALID_RUBY_VER)
 
-RUBY27?=		"@comment "
 RUBY30?=		"@comment "
 RUBY31?=		"@comment "
 RUBY32?=		"@comment "

Mk/bsd.default-versions.mk

@@ -10,7 +10,7 @@
 # Users who want to override these defaults can easily do so by defining
 # DEFAULT_VERSIONS in their make.conf as follows:
 #
-#   DEFAULT_VERSIONS=	perl5=5.20 ruby=2.7
+#   DEFAULT_VERSIONS=	perl5=5.20 ruby=3.1
 
 .if !defined(_INCLUDE_BSD_DEFAULT_VERSIONS_MK)
 _INCLUDE_BSD_DEFAULT_VERSIONS_MK=	yes
@@ -122,7 +122,7 @@ PYTHON_DEFAULT?=	3.9
 PYTHON2_DEFAULT?=	2.7
 # Possible values: 3.7, 3.8, 3.9, 3.10, 3.11
 PYTHON3_DEFAULT?=	3.9
-# Possible values: 2.7, 3.0, 3.1, 3.2
+# Possible values: 3.0, 3.1, 3.2
 RUBY_DEFAULT?=		3.1
 # Possible values: rust, rust-nightly
 RUST_DEFAULT?=		rust

lang/Makefile

@@ -307,7 +307,6 @@
     SUBDIR += rexx-regutil
     SUBDIR += rexx-wrapper
     SUBDIR += rhino
-    SUBDIR += ruby27
     SUBDIR += ruby30
     SUBDIR += ruby31
     SUBDIR += ruby32