Release IIB v8.4.3

What's Changed

• urllib3 is solo package by @lipoja in #579
• Update dependency urllib3 to v1.26.18 [SECURITY] by @renovate in #580
• Upgrade OPM to v1.26.4 by @chandwanitulsi in #577
• Update dependency SQLAlchemy to v2.0.22 by @renovate in #567
• Update dependency python-dateutil to v2.8.2 by @renovate in #547
• Update dependency cryptography to v41.0.5 by @renovate in #582
• Adding graph update mode for merge index image API endpoint by @lipoja in #578
• Update dependency gssapi to v1.8.3 by @renovate in #583
• Update dependency flask-migrate to v4.0.5 by @renovate in #568
• Update dependency psycopg2-binary to v2.9.9 by @renovate in #573
• Release IIB v8.4.3 by @chandwanitulsi in #587

Full Changelog: v8.4.2...v8.4.3