Revert "Version 9.10.0"

This reverts commit 519ee9d6.

Reason for revert: Need to adjust to 10.0

Original change's description:
> Version 9.10.0
>
> Change-Id: I1be4d945e1ba2c1816b5fd335e7fe08eb4aca4c1
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3404534
> Reviewed-by: Lutz Vahl <vahl@chromium.org>
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Commit-Queue: Liviu Rau <liviurau@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#78702}

Change-Id: I2f6f8b64123d477f7c982e2623aca43fc8b245ae
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3404771
Auto-Submit: Lutz Vahl <vahl@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Lutz Vahl <vahl@chromium.org>
Reviewed-by: Liviu Rau <liviurau@chromium.org>
Commit-Queue: Liviu Rau <liviurau@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78703}

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 9
-#define V8_MINOR_VERSION 10
+#define V8_MINOR_VERSION 9
 #define V8_BUILD_NUMBER 0
 #define V8_PATCH_LEVEL 0