cmake: upgraded package to upstream

Upgraded dev-util/cmake to version 3.20.5 on amd64

BUG=b:197413580
TEST=emerge, "cmake --version" reports 3.20.5
TEST=compile zephyr using 3.20.5

Change-Id: I6a359405bed2d1fcd24a24cef31b443ed57e4833
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/3123269
Tested-by: Jack Rosenthal <jrosenth@chromium.org>
Auto-Submit: Jack Rosenthal <jrosenth@chromium.org>
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
Commit-Queue: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
10 files changed