Bootstrap: refresh gen-0 sidecar stamp after spine 4769 sync (#18550)

[PurHur]

Summary

• Refresh prelinked/bootstrap-gen0/.m3_compiler_lib_sidecar.sha + manifest after Bootstrap: spine sync wddx + JIT hash/multipart units (#18550) #18558 spine sync (4769/4769).
• Follow-up to merged PR Bootstrap: spine sync wddx + JIT hash/multipart units (#18550) #18558 — spine entries landed without sidecar stamp refresh.

Follows #18550

Verification

php script/check-selfhost-spine-sidecar-sync.php
# check-selfhost-spine-sidecar-sync: OK (stamp matches spine entry SHA-1 5374113fde0055dc2d0864a2af26451dd050e642)

make bootstrap-selfhost-vm-driver-execute-probe
# bootstrap-selfhost-vm-driver-execute-probe: OK

./script/docker-exec.sh -- bash -lc 'make north-star5-verify-fast'
# north-star5-verify: OK (fast)

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