river 0.2.5

This release makes no functional changes since 0.2.4. The only difference
is that it requires Zig 0.11 rather than Zig 0.10.

I had originally planned for 0.3.0 to be the next release and to update the
zig version required then, but 0.3.0 is taking longer than expect to wrap up
at my quality standards. Distro maintainers requested a Zig 0.11 compatible
release to ease packaging until 0.3.0 is done.

Full changelog:

Isaac Freund (3):
      build: bump version to 0.2.5-dev
      build: update to Zig 0.11.0
      build: bump version to 0.2.5