Changed version number to 8.7

TBR=vahl@chromium.org

Change-Id: Ie869b55eccd0bd0d23cc62c7ec7884dbaa8e7c4d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2366701Reviewed-by: Lutz Vahl <vahl@chromium.org>
Commit-Queue: Lutz Vahl <vahl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69505}

include/v8-version.h

@@ -9,7 +9,7 @@
 // NOTE these macros are used by some of the tool scripts and the build
 // system so their names cannot be changed without changing the scripts.
 #define V8_MAJOR_VERSION 8
-#define V8_MINOR_VERSION 6
+#define V8_MINOR_VERSION 7
 #define V8_BUILD_NUMBER 0
 #define V8_PATCH_LEVEL 0