Release 8.8.56

What's Changed

• CLDSRV-674: handle cross-account bucket policies by @leif-scality in #5855
• W/8.8/bugfix/cldsrv 674 by @leif-scality in #5884
• CLDSRV-674: bump package.json by @leif-scality in #5887

Full Changelog: 8.8.55...8.8.56