I didn’t find a way to stop it, but after 2 years I figured it was time to just spin up a new VM.
Step 1. Exported a backup of my current HA install to my local PC.
Step 2. Import a new VM using the instructions from this post.
Step 3. Shut down old HA VM & new HA VM.
Step 4. Copy network settings (IPs & MAC Add) and CPU/memory settings from old VM to new VM.
Step 5. Transfer any passthrough hardware from old VM to new VM.
Step 6. Start new VM.
Step 7. Import backup from step 1 on first login and wait until it completes.
Restoring the backup took over a half hour but everything worked flawlessly. Keep your old HA VM for a couple days in case you spot any issues and have to revert back. My HA disk space went from over 200GB (after cleaning old backups) to about 60GB. It’s kind of a kludgy fix but even doing it every couple years is nothing compared to the work I had to do to keep Hubitat stable.