clang-format: set standard to 'Latest'

Per the LLVM code, the string 'Cpp11' is actually an alias to 'Latest',
while 'C++11' is C++11.  We want to tend towards using the latest C++
standard anyhow, so set clang-format to 'Latest'.  This is both what we
are already asking clang-format to do and clearer for people looking at
the file.

https://github.com/llvm/llvm-project/commit/e5032567903de19962333c4bf7d2edceaf4f9824#diff-b49a097415dff2837d9626d422c58ba8R82

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I430c58633b0d285cc617d013f8a1d6b3832aeba5
diff --git a/style/cpp/.clang-format b/style/cpp/.clang-format
index ef6f54e..52ac0a1 100644
--- a/style/cpp/.clang-format
+++ b/style/cpp/.clang-format
@@ -108,7 +108,7 @@
 SpacesInCStyleCastParentheses: false
 SpacesInParentheses: false
 SpacesInSquareBrackets: false
-Standard:        Cpp11
+Standard:        Latest
 TabWidth:        4
 UseTab:          Never
 ...