[1.8.x] Remove version in LICENSE files

[manuzhang]

As suggested by @rdblue in #12767 (comment)

[jbonofre]

This change seems super large compared to just update Parquet version on a release branch 😄
As a kind of temporary cleanup waiting tool.

I still believe it's better to keep the version, at least for MIT/BSD dependency.

Removing the version for ALv2 dependencies is ok, but I would keep for MIT/BSD.

[manuzhang]

I used a regex to remove all at once. It will be challenging to just remove ALv2 😂.

I'll send another PR to update parquet versions and let community to decide which way to go.

[jbonofre]

@manuzhang so to be clear, rethinking about that, I think we should keep the versions. According to my comment here (#12730 (comment)), the version is a good documentation, as the version in our dependencies is not the version in the bundle artifact (as version can come from transitive).
I have the PR ready for main and 1.9.x branches. I'm happy to do that for 1.8.x too.
Imho, the release manager should check the version before release (it took me 10mn and I can share the script using dependency version check).

[jbonofre]

Superseeded by #12834

[jbonofre]

#12834 has been merged and 1.8.x is clean now. I would suggest to close this PR.