Bump to soversion=19, 1.8.3

Note that cmake is deprecated, but we keep it in-sync manually for now.
diff --git a/include/json/version.h b/include/json/version.h
index d953961..b1d2a5f 100644
--- a/include/json/version.h
+++ b/include/json/version.h
@@ -3,10 +3,10 @@
 #ifndef JSON_VERSION_H_INCLUDED
 # define JSON_VERSION_H_INCLUDED
 
-# define JSONCPP_VERSION_STRING "1.8.2"
+# define JSONCPP_VERSION_STRING "1.8.3"
 # define JSONCPP_VERSION_MAJOR 1
 # define JSONCPP_VERSION_MINOR 8
-# define JSONCPP_VERSION_PATCH 2
+# define JSONCPP_VERSION_PATCH 3
 # define JSONCPP_VERSION_QUALIFIER
 # define JSONCPP_VERSION_HEXA ((JSONCPP_VERSION_MAJOR << 24) | (JSONCPP_VERSION_MINOR << 16) | (JSONCPP_VERSION_PATCH << 8))