INSTALLING.MD misses some dependencies

[U65535F]

To install the dependencies, the guide says:

Install dependencies. During installation, use default=all by leaving the input blank and pressing enter.
64-bit: pacman -S mingw-w64-x86_64-toolchain make mingw-w64-x86_64-cmake git
32-bit: pacman -S mingw-w64-i686-toolchain make mingw-w64-i686-cmake git

And then it says to install JDK 21,

On all platforms, install Java JDK 21:

curl -s "https://get.sdkman.io" | bash
sdk install java 21.0.2.fx-librca

But it seems like that script requires unzip and zip packages to be installed on the system. So it would be better if we just add those packages to the dependency installation section in the installing.md.

How to reproduce:

1. Install MSYS2 (Windows) freshly
2. Do not install any packages, only execute the commands listed in the installing.md.
3. When executing the SDK installer script, it will fail saying that Please install unzip on your system ...

[U65535F]

Additionally, it is also not written in the guide that you have to restart your MSYS2 after you install sdkman. It will display that the command sdk is not found if you directly try to install. Either you have to resource the bash_profile using source ~/.bash_profile or you have to restart the MSYS2 to get it working.