Update zcash_address requirement from 0.2 to 0.3

[dependabot[bot]]

Updates the requirements on zcash_address to permit the latest version.

Release notes

Sourced from zcash_address's releases.

Zcash crates 0.3.0

• zcash_primitives 0.3.0
• zcash_proofs 0.3.0
• zcash_client_backend 0.3.0
• zcash_client_sqlite 0.1.0

Commits

• 60ac107 Release zcash_address version 0.3.0
• 75e529e Upgrade to bs58 0.5
• 3dd0c63 Update to incrementalmerkletree 0.4, orchard 0.5
• b0ca7ff Merge remote-tracking branch 'upstream/main' into release/primitives_0.12-etc
• d2c5818 Merge pull request #853 from nuttycom/doc/zip321_errors
• 80adb54 Release zcash_note_encryption version 0.4.0
• 0b126a1 Clarify Zip321Error::TooManyPayments documentation.
• bca951b doc-only: Document ZIP 321 error variants.
• de771b7 Merge pull request #852 from nuttycom/wallet/sapling_cleanup
• 92d08b8 Move zcash_client_sqlite Sapling wallet functionality to a dedicated module.
• Additional commits viewable in compare view

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[teor2345]

Updated in PR #91

[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.