Upgrade `github.com/SaveTheRbtz/zstd-seekable-format-go/pkg` from
`v0.8.3` to `v0.10.0`:
https://github.com/SaveTheRbtz/zstd-seekable-format-go/releases/tag/pkg%2Fv0.10.0
This keeps Gitea's seekable zstd wrapper on the stable v0.10 API while
preserving the existing public `modules/zstd` API.
API migration:
- update `SeekableWriter` and `SeekableReader` internals for the
concrete `*seekable.Writer` and `*seekable.Reader` types introduced by
SaveTheRbtz/zstd-seekable-format-go#264
- update generated dependency metadata after `go mod tidy` removed the
now-unused `github.com/google/btree` transitive dependency
- no Gitea call sites needed changes because `modules/zstd` still
exposes the same constructors and interfaces
Validation:
- `go test ./modules/zstd`
- `make --always-make checks-backend`
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Co-authored-by: Giteabot <teabot@gitea.io>
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