merge revision(s) 110f242ef9b495037f59e4972ee102a8b8b372d5: [Backport #17861]

	Also `\U` after control/meta is invalid [Bug #17861]

	As well as `\u`, `\U` should be invalid there too.
	And highlight including `u`/`U` not only the backslash before it.
	---
	 parse.y                 | 12 ++++++++++--
	 test/ruby/test_parse.rb | 15 +++++++++++++++
	 2 files changed, 25 insertions(+), 2 deletions(-)

1 files changed, 1 insertions, 1 deletions

diff --git a/version.h b/version.h
index 9ba6754fc9..643f264be4 100644
--- a/version.h
+++ b/version.h
@@ -12,7 +12,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 2
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 80
+#define RUBY_PATCHLEVEL 81
 
 #define RUBY_RELEASE_YEAR 2021
 #define RUBY_RELEASE_MONTH 5