Update jsoncpp metadata to version 1.10.0

This change updates the Version and CPEPrefix fields in
third_party/jsoncpp/README.chromium to fix metadata validation errors.
The version is retrieved from third_party/jsoncpp/source/CMakeLists.txt.

Fixed: 515869395
Change-Id: I494ad7e5ffd7c1affef55f41a4693b2f858157f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/8032893
Commit-Queue: Jordan Bayles <jophba@chromium.org>
Reviewed-by: Jiewei Qian <qjw@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1657531}
NOKEYCHECK=True
GitOrigin-RevId: 870e348d24442bc0c27b33cd823511240d223707