Fix building the release binaries

[abusch]

The release binaries job failed for v0.2.0 (run).

What happened

Only aarch64-unknown-linux-musl failed: the other eight targets were cancelled by the matrix's default fail-fast, before they started.

The musl targets are built with cross, which couldn't read Cargo.toml:

expected a table key, found a newline at line 25 column 11

The rustls and tracing-subscriber dependencies were written as multi-line inline tables. That's TOML 1.1 syntax, which recent Cargo accepts but cross's TOML parser doesn't.

Changes

• Write those two dependencies on one line each, like the others. A TOML 1.0 parser (toml 0.8) rejects the released Cargo.toml and accepts this one.
• Turn off fail-fast in the binaries matrix, so one broken target doesn't cancel the others.

After merging

• Running "Release binaries" by hand for v0.2.0 should attach the seven non-musl binaries. The musl ones will fail again, because the tag has the old Cargo.toml.
• release-plz will propose v0.2.1 for the fix; releasing it builds all nine.

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