Fix invalid encoding on level 9 with single value input (#1115)

* Fix invalid encoding on level 9 with single value input

With single value input and a full block write (>=64K) the indexing function would overflow a uint16 to a 0.

This would make it impossible to generate a valid huffman table for the literal size prediction.

In turn this would mean that the entire block would be output as literals - since the cost of the value would be 0 bits.

This would in turn mean that EOB could not be encoded for the bit writer - since there were no matches. This was previously being satisfied with "filling".

Fixes:

1. First never encode more than `maxFlateBlockTokens` - 32K for the literal estimate table.
2. Always include EOB explicitly - if somehow literals should slip through.
3. Add test that will write big single-value input as regression test. Others were using copy that does smaller writes.

Fixes #1114

* Retract v1.18.1

build(deps): bump the github-actions group with 2 updates (#1105)

Bumps the github-actions group with 2 updates: [github/codeql-action](https://github.com/github/codeql-action) and [actions/setup-go](https://github.com/actions/setup-go).


Updates `github/codeql-action` from 3.30.0 to 3.30.5
- [Release notes](https://github.com/github/codeql-action/releases)
- [Changelog](https://github.com/github/codeql-action/blob/main/CHANGELOG.md)
- [Commits](github/codeql-action@2d92b76...3599b3b)

Updates `actions/setup-go` from 5.5.0 to 6.0.0
- [Release notes](https://github.com/actions/setup-go/releases)
- [Commits](actions/setup-go@v5.5.0...v6)

---
updated-dependencies:
- dependency-name: github/codeql-action
  dependency-version: 3.30.5
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: github-actions
- dependency-name: actions/setup-go
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Deprecate Go 1.21 and add 1.24 (#1055)

* Deprecate Go 1.21 and add 1.24
* Update s2sx go.mod

Remove old docs, prep for new release.

zstd: Fix extra CRC written with multiple Close calls (#1017)

* zstd: Fix extra CRC written with multiple Close calls
* Also check write/flush after close.

Fixes #1016

Update README.md

Upgrade zlib to upstream (#971)

Mostly cosmetic changes.

Update README.md

tests: Rename fuzz helpers back. (#931)

s2: Fix DecodeConcurrent deadlock on errors (#925)

When DecodeConcurrent encounters an error it can lock up in some cases.

Fix and add fuzz test for stream decoding.

Fixes #920

s2: Document and test how to peek the stream for skippable blocks (#918)

Co-authored-by: Klaus Post <[email protected]>