dbt_utils internally references deprecated macros

[clausherther]

Describe the bug

In version 0.9.0, the package is still referencing deprecated macros, such as safe_cast and various type_ macros.
This causes deprecation warnings in downstream packages and projects even if those projects no longer reference the deprecated macros (but reference a macro that internally uses a deprecated macro).

Steps to reproduce

• Include dbt_utils 0.9.0 in a project.
• Use dbt_utils.surrogate_key() or dbt_utils.date_spine() in a model

Expected results

No deprecation warnings should be triggered.

Actual results

Deprecation warnings are triggered.

Screenshots and log output

13:25:43  Warning: the `type_timestamp` macro is now provided in dbt Core. It is no longer available in dbt_utils and backwards compatibility will be removed in a future version of the package. Use `type_timestamp` (no prefix) instead. The dbt_date_integration_tests.dim_hour model triggered this warning.

System information

The contents of your packages.yml file:

packages:
  - package: dbt-labs/dbt_utils
    version: [">=0.9.0", "<1.0.0"]

Which database are you using dbt with?

• postgres
• redshift
• bigquery
• snowflake
• other (specify: ____________)

The output of dbt --version:

Core:
  - installed: 1.2.1
  - latest:    1.2.1 - Up to date!

Plugins:
  - bigquery:  1.2.0 - Up to date!
  - snowflake: 1.2.0 - Up to date!
  - postgres:  1.2.1 - Up to date!

Additional context

Are you interested in contributing the fix?

Yes, here's a PR #650