Update ntp_sandbox for glibc-2.34/kernel-5.14
Fix x86-64/riscv64 seccomp failures:
x86-64:
2021-12-30T09:32:04 ntpd[341]: ERR: SIGSYS: got a trap.
2021-12-30T09:32:04 ntpd[341]: ERR: SIGSYS/seccomp bad syscall 262/0xc000003e
riscv64:
2018-03-09T12:35:32 ntpd[341]: ERR: SIGSYS: got a trap.
2018-03-09T12:35:32 ntpd[341]: ERR: SIGSYS/seccomp bad syscall 48/0xc00000f3
Fixes: #719 (closed)