TF: upgrade CMake from 3.15.0 to 3.15.7

Avoid CMake build-dependency to rot.
CMake 3.15.0 is very old.
The 3.15.x serie received several bugfix releases since 3.15.0 release.
CMake 3.15.0 has been released on July 2019.
CMake 3.15.7 has been released on February 2020.

Previous 3.15.x serie changelogs:
https://cmake.org/cmake/help/v3.15/release/3.15.html
https://blog.kitware.com/cmake-3-15-5-available-for-download/
https://blog.kitware.com/cmake-3-15-6-available-for-download/
https://blog.kitware.com/cmake-3-15-7-available-for-download/

Signed-off-by: Fathi Boudra <fathi.boudra@linaro.org>
Change-Id: Ia82bbe770ecb78fc052b15f2318b662e60699a8d
diff --git a/bionic-amd64-tf-a-build/tf-dependencies.install b/bionic-amd64-tf-a-build/tf-dependencies.install
index f52af48..26692c5 100755
--- a/bionic-amd64-tf-a-build/tf-dependencies.install
+++ b/bionic-amd64-tf-a-build/tf-dependencies.install
@@ -18,7 +18,7 @@
 
 # Install CMake
 curl --connect-timeout 5 --retry 5 --retry-delay 1 --create-dirs -fsSLo /tmp/cmake-Linux-x86_64.tar.gz \
-  https://github.com/Kitware/CMake/releases/download/v3.15.0/cmake-3.15.0-Linux-x86_64.tar.gz
+  https://github.com/Kitware/CMake/releases/download/v3.15.7/cmake-3.15.7-Linux-x86_64.tar.gz
 tar -xf /tmp/cmake-Linux-x86_64.tar.gz -C ${TOOLS_DIR} --strip-components=1
 
 # Install Arm GCC toolchain (arm-none-eabi)
diff --git a/bionic-amd64-tf-m-build/tf-dependencies.install b/bionic-amd64-tf-m-build/tf-dependencies.install
index 4470248..ac09692 100755
--- a/bionic-amd64-tf-m-build/tf-dependencies.install
+++ b/bionic-amd64-tf-m-build/tf-dependencies.install
@@ -18,7 +18,7 @@
 
 # Install CMake
 curl --connect-timeout 5 --retry 5 --retry-delay 1 --create-dirs -fsSLo /tmp/cmake-Linux-x86_64.tar.gz \
-  https://github.com/Kitware/CMake/releases/download/v3.15.0/cmake-3.15.0-Linux-x86_64.tar.gz
+  https://github.com/Kitware/CMake/releases/download/v3.15.7/cmake-3.15.7-Linux-x86_64.tar.gz
 tar -xf /tmp/cmake-Linux-x86_64.tar.gz -C ${TOOLS_DIR} --strip-components=1
 
 # Install Arm GCC toolchain (arm-none-eabi)