Bump version to 10.3.0.dev0. Switch to cpptango 10.3.0dev

Yury Matveevrequested to merge
bump-10.3.0dev0 into develop

Bump version after 10.1.1 release. The next cppTango release is 10.3.0, so we follow this.

The extension code doesn't currently compile due to changes in cppTango.

Pixi and docker wheel dependencies updated.

Update pixi to use cpptango 10.3.0dev

Merge request reports