[BUG]: Memory leak

[AlmostInteractive]

Describe the bug
Activating the iCal sensor node leaks memory until eventually it crashes HA.

To Reproduce
Steps to reproduce the behavior:

1. Setup an ical sensor to a gmail account
2. set it on a manual trigger that repeats (quickly for fastest results. The screenshot below was taken with a 1 sec interval with two iCal sensor nodes)
3. watch the NodeRed memory usage climb rapidly

Expected behavior
Ideally no memory leak, but a small increase in memory followed by a periodic cleanup would be fine too.

Screenshots

Additional context
Add any other context about the problem here.

[AlmostInteractive]

Putting bug on the NR node repo, not the base repo