Update README.OpenSource

Be consistent with OSTMS

Issue: I6VS78
Signed-off-by: Nfangting <fangting12@huawei.com>

README.OpenSource

@@ -3,7 +3,7 @@
         "Name"                  : "musl",
         "License"               : "MIT License",
         "License File"          : "COPYRIGHT",
-        "Version Number"        : "1.2.0",
+        "Version Number"        : "1.2.3",
         "Owner"                 : "jianghan2@huawei.com",
         "Upstream URL"          : "http://www.musl-libc.org/",
         "Description"           : "musl is an MIT-licensed implementation of the standard C library"