zstd: Update to version 1.5.2

zstd: Update to version 1.5.2

- Update from 1.5.1 to 1.5.2
- Update of rootfile
- Changelog
   v1.5.2 (Jan, 2022)
     perf: Regain Minimal memset()-ing During Reuse of Compression Contexts (@Cyan4973, #2969)
     build: Build Zstd with `noexecstack` on All Architectures (@felixhandte, #2964)
     doc: Clarify Licensing (@terrelln, #2981)

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>