update dependencies

vendor/golang.org/x/text/secure/precis/nickname.go

@@ -23,24 +23,26 @@ func (t *nickAdditionalMapping) Reset() {
 }
 
 func (t *nickAdditionalMapping) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
-	// RFC 7700 §2.1.  Rules
+	// RFC 8266 §2.1.  Rules
 	//
 	// 2.  Additional Mapping Rule: The additional mapping rule consists of
-	//                              the following sub-rules.
+	//     the following sub-rules.
 	//
-	//        1.  Any instances of non-ASCII space MUST be mapped to ASCII
-	//            space (U+0020); a non-ASCII space is any Unicode code point
-	//            having a general category of "Zs", naturally with the
-	//            exception of U+0020.
+	//     a.  Map any instances of non-ASCII space to SPACE (U+0020); a
+	//         non-ASCII space is any Unicode code point having a general
+	//         category of "Zs", naturally with the exception of SPACE
+	//         (U+0020).  (The inclusion of only ASCII space prevents
+	//         confusion with various non-ASCII space code points, many of
+	//         which are difficult to reproduce across different input
+	//         methods.)
 	//
-	//        2.  Any instances of the ASCII space character at the beginning
-	//            or end of a nickname MUST be removed (e.g., "stpeter " is
-	//            mapped to "stpeter").
+	//     b.  Remove any instances of the ASCII space character at the
+	//         beginning or end of a nickname (e.g., "stpeter " is mapped to
+	//         "stpeter").
 	//
-	//        3.  Interior sequences of more than one ASCII space character
-	//            MUST be mapped to a single ASCII space character (e.g.,
-	//            "St  Peter" is mapped to "St Peter").
-
+	//     c.  Map interior sequences of more than one ASCII space character
+	//         to a single ASCII space character (e.g., "St  Peter" is
+	//         mapped to "St Peter").
 	for nSrc < len(src) {
 		r, size := utf8.DecodeRune(src[nSrc:])
 		if size == 0 { // Incomplete UTF-8 encoding