Bump postgrex from 0.15.10 to 0.15.11

[dependabot[bot]]

Bumps postgrex from 0.15.10 to 0.15.11.

Changelog

Sourced from postgrex's changelog.

v0.15.11 (2021-09-26)

• Enhancements
  • Support xid8 type introduced in PostgreSQL 13

Commits

• 087e8e9 Release v0.15.11
• ad5716f #558 Support xid8 type (#559)
• See full diff in compare view

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