fix(sqlx-postgres): Make IpNetwork serde compatible again

[michaelvanstraten]

In c79ccb7 we bumped the ipnetwork crate from 0.20.0 to 0.21.1 which made serde a non default feature.

This patch re-enables this feature in the ipnetwork crate.

Does your PR solve an issue?

No

Is this a breaking change?

No

[abonander]

This is actually a good thing. It means users who don't need the Serde integration of ipnetwork aren't forced to pay for it. You can always re-enable it yourself.

The only thing that needs to be done here is maybe adding a note to the CHANGELOG entry:

sqlx/CHANGELOG.md

Line 49 in 4249cb4

* [[#3670]]: Bump ipnetwork to v0.21.1 [[@BeauGieskens]]

[michaelvanstraten]

I was stupid, I have sqlx as a workspace dependency and added

ipnetwork = { version = "*", features = ["serde"] }

to the virtual manifest and forgot it in the crates manifest.

Thanks

[abonander]

I don't recommend using * for a dependency specification. Cargo will not always unify that correctly as it's not forbidden from compiling multiple versions of ipnetwork in the same graph. It only appears to work because ipnetwork = "0.21.1" is the latest version. One cargo update at any time after a new release could potentially break your build.