Push Gleam version requirement to >= 1.1.0

[leonqadirie]

static_supervisor.gleam uses the @internal annotation, resulting in the following warning:

Incompatible gleam version range
This requires a Gleam version >= 1.1.0.
The `@internal` annotation was introduced in version v1.1.0. But the Gleam
version range specified in your `gleam.toml` would allow this code to run
on an earlier version like v0.32.0, resulting in compilation errors!

[leonqadirie]

Closed in favor of #79.

[lpil]

Thank you