Cargo: version 0.3.1 -> 0.3.2

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This cuts a new release bringing in some changes since 0.3.1.

Proposed release notes

• Fixed loading of native certificates using rustls-native-certs on FreeBSD systems using the webpki based UNIX verifier.
• Reduced transitive dependencies for platforms requiring a webpki dependency. Notably this avoids the unconditional inclusion of ring.

Post-merge steps

• Generate Android Maven artifacts locally - N/A - no non-test changes made under android/
• Create and push Git tag - done, v/0.3.2.
• cargo publish for each required crate, based on release steps - Published rustls-platform-verifier v0.3.2 at registry crates-io
• Create companion GitHub release - created v/0.3.2 GitHub release

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Published 🚀