4.1.0

What's Changed

• chore: remove schema tool source layout check by @jjaakola-aiven in #978
• fix: validate REST Proxy subscription param types by @jjaakola-aiven in #981
• tests,backup: fix flakiness by using current timestamps by @davide-armand in #982
• fix: proto3 optionals from base64 encoded proto descriptors by @keejon in #986
• backup: add command line flag to override replication factor in restore command by @biggusdonzus in #988

Full Changelog: 4.0.0...4.1.0