entity.manager calls within Drupal 9 site

[dbaniszewski]

When attempting to run updb on a Drupal 9 site, we're running into issues with a depricated function entity.manager.

Do you wish to run the specified pending updates? (yes/no) [yes]:

y

[notice] Update started: ut_news_update_8001
[error] You have requested a non-existent service "entity.manager".
[error] Update failed: ut_news_update_8001
[error] Update aborted by: ut_news_update_8001
[error] Finished performing updates.

The site is running
UMD Terp Base (umd_terp_base) Enabled 8.1.59
UMD Terp (umd_terp) Enabled 8.1.105

[drogers98]

I believe this is actually due to the umd_terp_base module, and a module it relies upon, external_data_source. More info on the fix here: UMD-Digital/umd_terp_base#5