cargo: update sentry to fix memory initialization issue

Older sentry had an unsafe memory initialization error, which wasn't
caught by older compilers. Rust 1.48 catches the problem at runtime and
raises a panic. This meant that new builds (eg, on QA machine after
update) were panic-ing.

Newest versions of sentry have modern dependencies, which breaks our
crufty old 'iron' dependency tree. Work-around is to only partially
update (v0.12 to v0.15).

This is a fairly frustrating situation. I'm hopeful that when we update
to a different web framework and openapi generator 5.0 (not yet
released), many of these dependency issues will be resolved, but i'm not
certain. I did notice that if we entirely remove Sentry, which has not
really been used much (only a small handful of issues reported over
several years), we might be able to resolve openssl dependency issues.

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