bump up RUBY_PATCHLEVEL

Fix StartTLS stripping vulnerability

Reported by Alexandr Savca in https://hackerone.com/reports/1178562

Co-authored-by: Shugo Maeda <shugo@ruby-lang.org>

add tag v2_6_8

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v2_6_8@67951 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Get rid of multibyte prefix to tmpdir

merge revision(s) 856a970:

	Get rid of multibyte prefix to tmpdir

	---
	 test/ruby/test_require.rb | 12 ++++++------
	 1 file changed, 6 insertions(+), 6 deletions(-)

add tag v2_6_7

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v2_6_7@67941 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

add tag v2_5_9

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v2_5_9@67939 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Disable DTrace in FreeBSD (ruby#3999)

The latest ruby cannot compile with FreeBSD Dtrace enabled.

gen-release-note.rb: Avoid to depend release metadata

Because it doesn't have metadata when I edit draft.

irb: Removed unused variables