This PR will upgrade all dependencies and upgrade Flutter SDK constraint to 2.8.
The branch will be used to release the following -dev versions
nhost_sdk 4.0.0-dev.x
nhost_flutter_auth 3.0.0-dev.x
nhost_gql_links 2.0.5-dev.x
nhost_graphql_adapter 3.0.0-dev.x
nhost_flutter_graphql 3.0.0-dev.x
This PR will upgrade all dependencies and upgrade Flutter SDK constraint to 2.8.
The branch will be used to release the following -dev versions nhost_sdk 4.0.0-dev.x nhost_flutter_auth 3.0.0-dev.x nhost_gql_links 2.0.5-dev.x nhost_graphql_adapter 3.0.0-dev.x nhost_flutter_graphql 3.0.0-dev.x