Update dependency wpackagist-plugin/activitypub to v0.14.2

This MR contains the following updates:

Package	Type	Update	Change
wpackagist-plugin/activitypub (source)	require	minor	0.13.4 -> 0.14.2

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docker/conf/services.d/wpcron/run

@@ -3,5 +3,5 @@
 # The "run-cron" execution takes a few minutes, so the actual period
 # comess out at something closer to 10 minutes.
 export BATCH_SIZE=300
-exec every 300 on-local-blogs run-cron >/dev/null
+exec nice ionice -c 3 every 300 on-local-blogs run-cron >/dev/null