[CI Run] ambex: Remove usage of md5

[Alice-Lilith]

When trying to run emissary in crypto-restricted environments (e.g. FIPS), usage of md5 can be problematic:

time="2024-10-17 19:20:29.7063" level=error msg="shut down with error error: PANIC: openssl: MD5 failed" func=github.com/emissary-ingress/emissary/v3/pkg/busy.Main file="github.com/emissary-ingress/emissary/v3/pkg/busy/busy.go:87" CMD=entrypoint PID=1

This replaces the usage with xxhash, which should avoid usage of unsupport crypto libraries, but keep the deterministic behavior.

Signed-off-by: Billy Lynch [email protected]
(cherry picked from commit f1b539c)

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