environmental-forecasting/model-ensembler

AI Summary: Update the Makefile for the `model-ensembler` project to remove redundant elements introduced by changes up to version 0.6.2. This involves identifying and removing obsolete commands or targets within the Makefile to streamline the build process.

AI Summary: Update the `model-ensembler` project to replace the deprecated `datetime.datetime.utcnow()` function with the timezone-aware alternative `datetime.datetime.now(datetime.UTC)` to address a deprecation warning. This involves locating the line of code using the deprecated function within the project's logging mechanism and modifying it to use the recommended replacement.