Update docs/software/prgenv/prgenv-gnu.md

Author: msimberg

docs/software/prgenv/prgenv-gnu.md

@@ -122,25 +122,6 @@ We will provide full support for 12 months after the uenv image is released, and
         * [[email protected]](https://packages.spack.io/package.html?name=netcdf-cxx)
         * [[email protected]](https://packages.spack.io/package.html?name=netcdf-fortran)
 
-=== "25.06"
-
-    !!! warning "Prerelease"
-        The `prgenv-gnu/25.06` uenv is currently available as a prerelease on [daint][ref-cluster-daint], and is subject to change before the final release.
-        Prereleases are tagged with `rcN` tags.
-        [Let us know][ref-get-in-touch] if you find issues with the uenv.
-
-    !!! warning "Unstable Spack version used for the uenv"
-        If you are [building software through spack on top of a uenv][ref-build-uenv-spack], be aware that the 25.06 uenv is based on a prerelease version of Spack that contains [many breaking changes](https://github.com/spack/spack/discussions/30634).
-        Using a commit other than the one used to build the uenv will likely result in issues.
-
-    The key updates in version 25.06 compared to 24.11 are:
-
-    * upgrading GCC to version 14 and CUDA to version 12.9
-    * upgrading cray-mpich to version 8.1.32
-
-    ??? info "all packages exposed via the `default` and `modules` views in `v1`"
-        !!! todo "The list of 25.06 package versions is yet to be finalized"
-
 [](){#ref-uenv-prgenv-gnu-how-to-use}
 ## How to use