chore(deps): bump asyncpg from 0.29.0 to 0.31.0 in /backend

[dependabot]

Bumps asyncpg from 0.29.0 to 0.31.0.

Release notes

Sourced from asyncpg's releases.

v0.31.0

Enable Python 3.14 with experimental subinterpreter/freethreading support.

Improvements

• Add Python 3.14 support, experimental subinterpreter/freethreading support (#1279) (by @​elprans in 9e42642b)

• Avoid performing type introspection on known types (#1243) (by @​elprans in 5c9986c4)

• Make prepare() not use named statements by default when cache is disabled (#1245) (by @​elprans in 5b14653e)

• Implement connection service file functionality (#1223) (by @​AndrewJackson2020 in 1d63bb15)

Fixes

• Fix multi port connection string issue (#1222) (by @​AndrewJackson2020 in 01c0db7b)

• Avoid leaking connections if _can_use_connection fails (#1269) (by @​yuliy-openai in e94302d2)

Other

• Drop support for EOL Python 3.8 (#1281) (by @​elprans in 6c2c4904)

v0.30.0

Support Python 3.13 and PostgreSQL 17.

Improvements

• Implement GSSAPI authentication (by @​eltoder in 1d4e5680 for #1122)

• Implement SSPI authentication (by @​eltoder in 1aab2094 for #1128)

• Add initial typings (by @​bryanforbes in d42432bf for #1127)

• Allow building with Cython 3

... (truncated)

Commits

• 71775a6 asyncpg v0.31.0
• 508cae6 Test on PostgreSQL 18 (#1290)
• e534e5f Bump cibuildwheel
• 07fe512 Bump pgproto
• 648b35f Bump Cython to 3.2.1 (#1288)
• 9e42642 Add Python 3.14 support, experimental subinterpreter/freethreading support (#...
• 6fe1c49 Move development deps away from extras and into dependency groups (#1280)
• 7a54816 Fix a couple of missed Python version guards
• 6c2c490 Drop support for EOL Python 3.8 (#1281)
• 4c60ae8 Bump version to 0.31.0.dev0
• Additional commits viewable in compare view

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[Om-Talaviya]

Closing obsolete Dependabot PR and deleting branch as version updates are disabled.

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