Updating Github Actions for Github Deprecation

[callum-mcdata]

What is this PR?

This is a:

• bug fix with no breaking changes

Description & motivation

This PR mimics the work done in dbt-labs/dbt-core#6635

Checklist

• I have verified that these changes work locally on the following warehouses (Note: it's okay if you do not have access to all warehouses, this helps us understand what has been covered)
  • BigQuery
  • Postgres
  • Redshift
  • Snowflake
  • Databricks
• I have added an entry to CHANGELOG.md

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Tenets to keep in mind

• A metric value should be consistent everywhere that it is referenced
• We prefer generalized metrics with many dimensions over specific metrics with few dimensions
• It should be easier to use dbt’s metrics than it is to avoid them
• Organization and discoverability are as important as precision
• One-off models built to power metrics are an anti-pattern