Upgrade APN Library & Support Time-Sensitive Notifications

[gestrich]

• Update a deprecated APN package, used by Loop, to a more actively maintained fork from the parse community.
• The library upgrade fixes several vulnerabilities: 3 low, 2 moderate, and 3 high
• Remove 2 other libraries that were added when the old APN package was added: base64url, pem.
• Activate "time sensitive" push notifications, a feature of iOS 15 exposed in the new APN package. This allows time sensitive notifications to be delivered more quickly. This should help caregivers that have flaky push notification problems.

Example of Loop push notifications being delivered as "time sensitive":

[gestrich]

I don't normally work with NPM (I'm an iOS dev) so would appreciate any pointers on this PR and practices for working with node packages.

[gestrich]

I added this package using the command:

npm install @parse/node-apn

I originally tried this from node version 18* but it added a bunch of changes to the file unrelated to my update (adding the prefix "node_modules" to each depedency). So I downgraded my node to an earlier version, v14.21.3, per some advice from SO and then ran the command again.

[gestrich]

Looking at the original PR when the prior APN package was added, I see the "pem" and "base64url" libraries were added in the same PR. Those don't seem needed from what I can tell since upgrading the library. Below is the output of depcheck right after I removed apn, which shows those as unused. So I've removed from now but let me know if there is something I'm missing.

https://github.com/nightscout/cgm-remote-monitor/pull/5043/files#diff-7ae45ad102eab3b6d7e7896acd08c427a9b25b346470d7bc6507b6481575d519

depcheck
Unused dependencies
* acorn
* acorn-jsx
* base64url
* buffer
* crypto-browserify
* moment-locales-webpack-plugin
* pem
* process
* stream-browserify
* swagger-ui-dist
* webpack-cli
Unused devDependencies
* @types/tough-cookie
....

[gestrich]

Below here in the lock file, these updates seemed to implicitly happen from me removing the 3 libraries:

• apn
• base64url
• pem

[ps2]

LGTM!

[bewest]

Looks good, I will spend some time testing and integrating during my cycles, along with Nightscout Connect issues. Hopefully sometime this week.

[gestrich]

@bewest Thanks!