We already have the indirect require for 1.17.3, that comes
opencontainers/cgroups[1]. That module requires that version as min, so
go can't use older versions. We can just remove the excludes.

There might be cases where people can use runc as a dependency and use
replace to override it (not sure, but probably). We were clear on what
our dependencies are, so we can sleep fine. In the unlikely case that
some project uses runc as a dependency and:

 * Uses a replace for cilium v0.17.x but not the latest patch release (0.17.3 is fixed)
 * they run with 32bits
 * and hit this (that didn't happen always on CI)
 * Ignore the changelog for 0.17.3 that mentions the buffer overflow on
   32 bits platforms[2].

In that case, if we have a bug report, we can point them to the right
place. But 0.17.3 was released for some months now (most people probably
update) and 0.18.0 was released recently. I wouldn't worry about someone
hitting this in real life.

Also, the excludes directives prevent go install from working, so let's
just remove them.

[1]: https://github.com/opencontainers/cgroups/blob/9657f5a18b8d60a0f39fbb34d0cb7771e28e6278/go.mod#L6
[2]: https://github.com/cilium/ebpf/releases/tag/v0.17.3

Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>
(cherry picked from commit 67b8a68)