Add Ubuntu 26.04 support

[niam0t]

Describe the Feature

➜ bash -c "$(wget -q https://raw.githubusercontent.com/OpenBangla/OpenBangla-Keyboard/master/tools/install.sh -O -)"

|-------------------------------------------------------|
|-----Welcome to the OpenBangla Keyboard installer------|
|-------------------------------------------------------|

This helper script will install/update OpenBangla Keyboard in your system.
You might need to type your password for the installation to proceed.

After the installation completes successfully, you would need to configure
your desktop environment for OpenBangla Keyboard to work.
Visit https://github.com/OpenBangla/OpenBangla-Keyboard/wiki/Configuring-Environment
for instructions on how to configure your desktop environment.
--------------------------------------------------------

Downloading installation package for ubuntu ...
This Ubuntu release "26.04" is too young or too old for me to handle

Problem or Use Case

Installation scripts doesn't work on Ubuntu 26.04 LTS

Proposed Solution

No response

Additional Context

No response

[codayon]

For now, you should be able to install any .deb file from the latest release, and it should work.

https://github.com/OpenBangla/OpenBangla-Keyboard/releases/tag/2.0.0