Upgrade pgx to v5.6.0 to fix nil arg handling

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@jinzhu is already working on this.

Since Mar 9, 2025.

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Description

Description

gorm.io/driver/postgres currently depends on pgx v5.5.5, which has a breaking change in how nil values are handled. For example previously, nil values for jsonB columns were converted to {} via Valuer.Value(), but in pgx v5, nil is now inserted as NULL, causing NOT NULL constraint violations.

This issue was addressed in pgx v5.6.0 (jackc/pgx#1367), but gorm.io/driver/postgres has not yet upgraded to this version.

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