deps: patch V8 to 6.5.254.43

PR-URL: #19615
Refs: v8/v8@6.5.254.41...6.5.254.43
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Shingo Inoue <leko.noor@gmail.com>

deps/v8/include/v8-version.h

@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 6
 #define V8_MINOR_VERSION 5
 #define V8_BUILD_NUMBER 254
-#define V8_PATCH_LEVEL 41
+#define V8_PATCH_LEVEL 43
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)