Fix hash render end with colon (#31319)

Fix a hash render problem like `<hash>: xxxxx` which is usually used in
release notes.

(cherry picked from commit 7115dce773e3021b3538ae360c4e7344d5bbf45b)

modules/markup/html_internal_test.go

@@ -381,6 +381,7 @@ func TestRegExp_sha1CurrentPattern(t *testing.T) {
 		"(abcdefabcdefabcdefabcdefabcdefabcdefabcd)",
 		"[abcdefabcdefabcdefabcdefabcdefabcdefabcd]",
 		"abcdefabcdefabcdefabcdefabcdefabcdefabcd.",
+		"abcdefabcdefabcdefabcdefabcdefabcdefabcd:",
 	}
 	falseTestCases := []string{
 		"test",