Upgrade smoltcp to 0.12.0

[tlevora]

Description

Smoltcp updated to version 0.12.0. Examples fixed correspondingly.

TODO

1. Update CHANGELOG.md

[datdenkikniet]

Hi and thanks for the contribution!

Have you tested that all of this works as expected (i.e. ran the examples on some microcontroller)?

[datdenkikniet]

Additionally: if you would be so kind to add an entry to the changelog, and bump the version of stm32-eth to v0.8.0 (in separate commits, preferably in that order) we can get this shipped right out :)

[tlevora]

Hi and thanks for the contribution!

Have you tested that all of this works as expected (i.e. ran the examples on some microcontroller)?

I've successfully executed arp and smoltcp-client examples on STM32F746.

[tlevora]

Additionally: if you would be so kind to add an entry to the changelog, and bump the version of stm32-eth to v0.8.0 (in separate commits, preferably in that order) we can get this shipped right out :)

Sure, I could do that! Do you mean to bump the version + update changelog in a separate PR?

[datdenkikniet]

I've successfully executed arp and smoltcp-client examples on STM32F746.

Excellent, that sounds good enough for me.

Additionally: if you would be so kind to add an entry to the changelog, and bump the version of stm32-eth to v0.8.0 (in separate commits, preferably in that order) we can get this shipped right out :)

Sure, I could do that! Do you mean to bump the version + update changelog in a separate PR?

Great :) No, same PR is fine, just so long as they are separate commits, one for changelog, one for version bump. (I won't squash them, so we'll retain nice history on the master branch). Linking to the as-of-yet-nonexistent v0.8.0 tag in the changelog header is fine, I will add it ASAP.

[datdenkikniet]

Thanks again for your contribution :)

v0.8.0 is now available.

[tlevora]

@datdenkikniet: Thank you for your help and very quick response!