jammy-amd64-tf-a-build: update to CMake v3.20.0 for RMM build

Update the CMake version from v3.15.7 to v3.20.0 in the
tf-dependencies.install script to ensure compatibility with
RMM build requirements.

Change-Id: I7eaa8538556d3e442c65f2c0783a1d58feea3f53
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
1 file changed