Fix possible memory leak?

[cbeer]

$ docker logs folio-graphql
🚀 Server ready at http://localhost:4000

<--- Last few GCs --->

[1:0x7fea2b452510] 78138632 ms: Mark-Compact 4040.2 (4143.3) -> 4038.5 (4143.8) MB, 2051.45 / 0.01 ms  (average mu = 0.128, current mu = 0.003) allocation failure; scavenge might not succeed
[1:0x7fea2b452510] 78142580 ms: Mark-Compact 4039.8 (4144.1) -> 4039.0 (4144.0) MB, 3945.12 / 0.01 ms  (average mu = 0.055, current mu = 0.001) allocation failure; scavenge might not succeed


<--- JS stacktrace --->

FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory