chore: upgrade declared pg version to 13.14.0

[wenym1]

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What's changed and what's your intention?

For atlasgo to work. cc @neverchanje

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[chenzl25]

This line needs to be changed as well.

pub const SERVER_VERSION_NUM: i32 = 90500;

[chenzl25]

LGTM

[neverchanje]

Well done. Thanks

[yufansong]

LGTM