chore(deps): bump asyncpg from 0.18.3 to 0.21.0 in /server

[dependabot[bot]]

Bumps asyncpg from 0.18.3 to 0.21.0.

Release notes

Sourced from asyncpg's releases.

asyncpg v0.21.0

Improvements

• Add support for password functions (useful for RDS IAM auth) (#554) (by Harvey Frye in 1d9457f0 for #554)

• Add support for connection termination listeners (#525) (by @​iomintz in 8141b93c for #525)

• Update CI matrix, aarch64 builds (#595) (by @​Gelbpunkt in ac6a2fcf for #595)

Fixes

• Fix possible uninitalized pointer access on unexpected array message data (CVE-2020-17446, by @​elprans in 69bcdf5b, reported by @​risicle)

• Fix Connection class _copy_in private method (by @​ABCDeath in 7f5c2a24 for #555)

• Bump pgproto to fix compilation issues (by @​elprans in aa67d61b for #565)

• Improve pool documentation examples (#491) (by @​nyurik in 745f8f81 for #491)

• Update usage.rst (#572) (by @​xuedong09 in f5b425ae for #572)

• Fix links in connection documentation (#584) (by @​samuelcolvin in b0813204 for #584)

• Fix usage documentation for hstore (#515) (by @​aaliddell in 39040b3c for #515)

• Fix compiler warnings (by @​elprans in 6cb5ba19)

asyncpg v0.20.0

Improvements

• Support Python 3.8 (by @​1st1 in #504)

• Support PgBouncer by sending only a single SYNC message per query (by @​fvannee in b043fbd3)

... (truncated)

Commits

• 87a4302 asyncpg v0.21.0
• 6cb5ba1 Fix compiler warnings
• 69bcdf5 Fix possible uninitalized pointer access on unexpected array message data
• 39040b3 Fix usage documentation for hstore (#515)
• 8141b93 Add support for connection termination listeners (#525)
• b081320 Fix links in connection documentation (#584)
• f5b425a Update usage.rst (#572)
• 745f8f8 Improve pool documentation examples (#491)
• ac6a2fc Update CI matrix, aarch64 builds (#595)
• aa67d61 Bump pgproto to fix compilation issues
• Additional commits viewable in compare view

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