fix old and unsecure dependencies for flatpak

[redtux]

Description

Hi, I just wanted to test the flatpak installation method but got the following warnings regarding unsecure dependencies:

Info: org.gnome.Platform//40 is end-of-life, with reason:
   The GNOME 40 runtime is no longer supported as of March 21, 2022. Please ask your application developer to migrate to a supported platform.
Info: org.freedesktop.Platform.VAAPI.Intel//20.08 is end-of-life, with reason:
   org.freedesktop.Platform 20.08 is no longer receiving fixes and security updates. Please update to a supported runtime version.
Info: org.freedesktop.Platform.GL.default//20.08 is end-of-life, with reason:
   org.freedesktop.Platform 20.08 is no longer receiving fixes and security updates. Please update to a supported runtime version.

To Reproduce

sudo flatpak install flathub com.github.arshubham.gitignore

Expected behavior

The app should depend on stable libs, and it should install without security warnings.

[kbondarev]

I experience the same warnings every time I ran flatpak update:

Info: runtime org.gnome.Platform branch 40 is end-of-life, with reason:
   The GNOME 40 runtime is no longer supported as of March 21, 2022. Please ask your application developer to migrate to a supported platform.
Info: applications using this runtime:
   com.github.arshubham.gitignore

Info: runtime org.freedesktop.Platform.VAAPI.Intel branch 20.08 is end-of-life, with reason:
   org.freedesktop.Platform 20.08 is no longer receiving fixes and security updates. Please update to a supported runtime version.
Info: applications using this extension:
   com.github.arshubham.gitignore

Info: runtime org.freedesktop.Platform.GL.default branch 20.08 is end-of-life, with reason:
   org.freedesktop.Platform 20.08 is no longer receiving fixes and security updates. Please update to a supported runtime version.
Info: applications using this extension:
   com.github.arshubham.gitignore