Add msys2 package that includes CA certificates. (cyberbotics#6628)

* Add msys2 package that includes CA certificates.

These are needed to run test_suite.py.

* Add changelog entry.

docs/reference/changelog-r2024.md

@@ -23,4 +23,5 @@ Released on December **th, 2023.
     - Fixed incomplete loading while minimized under some windowing systems ([#6617](https://github.com/cyberbotics/webots/pull/6617)).
     - Fixed unitialized sliding friction when using asymmetric rolling friction ([#6618](https://github.com/cyberbotics/webots/pull/6618)).
     - Made `supervisor_export_image` work even if using the `--minimize --no-rendering` options ([#6622](https://github.com/cyberbotics/webots/pull/6622)).
+    - Fixed CA certificates needed by `test_suite.py` missing in Windows development environment ([#6628](https://github.com/cyberbotics/webots/pull/6628)).
     - Fixed to use a version of Qt that is still supported ([#6623](https://github.com/cyberbotics/webots/pull/6623)).

scripts/install/msys64_installer.sh

@@ -26,6 +26,7 @@ declare -a BASE_PACKAGES=(
   "mingw-w64-x86_64-ffmpeg"           # Webots movies
   "mingw-w64-x86_64-dlfcn"            # dependency of ffmpeg
   "mingw-w64-x86_64-python"           # python controllers and scripts
+  "mingw-w64-x86_64-ca-certificates"  # CA certs needed to run tests/test_suite.py 
 )
 
 declare -a OPTIONAL_PACKAGES=(