Preston Van Loon 108e2806cb Fastssz update to allow generics (#16628) ...

**What type of PR is this?**

Other

**What does this PR do? Why is it needed?**

Incorporates fastssz PR 19:
https://github.com/OffchainLabs/fastssz/pull/19.

**Which issues(s) does this PR fix?**

This allows for use of []primitives.ValidatorIndex in ssz code
generation.

**Other notes for review**

Most of the diff is regenerating ssz.go files. Review go.mod and
deps.bzl carefully.

**Acknowledgements**

- [x] I have read
[CONTRIBUTING.md](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md).
- [x] I have included a uniquely named [changelog fragment
file](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md#maintaining-changelogmd).
- [x] I have added a description with sufficient context for reviewers
to understand this PR.
- [x] I have tested that my changes work as expected and I added a
testing plan to the PR description (if applicable).

2026-04-01 20:44:08 +00:00

..

v1

Fastssz update to allow generics (#16628)

2026-04-01 20:44:08 +00:00