Bump dioxus version

[ealmloff]

This PR bumps diouxs to the current alpha version. Mainly just putting this up for visibility, there aren't any interesting changes required yet.

To use dioxus 0.7 with the SDK, you can add this patch to your cargo.toml:

[patch.crates-io]
dioxus-geolocation = { git = "https://github.com/ealmloff/dioxus-std", branch = "0.7" }
dioxus-notification = { git = "https://github.com/ealmloff/dioxus-std", branch = "0.7" }
dioxus-sdk = { git = "https://github.com/ealmloff/dioxus-std", branch = "0.7" }
dioxus_storage = { git = "https://github.com/ealmloff/dioxus-std", branch = "0.7" }
dioxus-sync = { git = "https://github.com/ealmloff/dioxus-std", branch = "0.7" }
dioxus-time = { git = "https://github.com/ealmloff/dioxus-std", branch = "0.7" }
dioxus-util = { git = "https://github.com/ealmloff/dioxus-std", branch = "0.7" }
dioxus-window = { git = "https://github.com/ealmloff/dioxus-std", branch = "0.7" }