[receiver/mongodbatlas] Audit log timestamp parsing fails to parse on 4.2 clusters

[BinaryFissionGames]

What happened?

## Description

When scraping 4.2 clusters, it seems that timestamps are formatted like this: `2022-09-16T15:26:52.563+0000`, but on 5.0 it's formatted like this: `2022-09-16T15:26:52.563+00:00`.

This causes the timestamp to fail to parse correctly.

Collector version

c0666b6

Environment information

No response

OpenTelemetry Collector configuration

No response

Log output

Time failed to parse correctly	{"kind": "receiver", "name": "mongodbatlas", "pipeline": "logs", "error": "parsing time \"2022-09-16T15:38:11.184+0000\" as \"2006-01-02T15:04:05.000-07:00\": cannot parse \"+0000\" as \"-07:00\""}

Additional context

No response

[github-actions]

Pinging code owners: @zenmoto. See Adding Labels via Comments if you do not have permissions to add labels yourself.