AltPods: pods updated - 1.21.0-SNAPSHOT

AltPods were updated to v1.21.0-SNAPSHOT to sync with recent releases.

Updated pods

• AppLovinSDK v11.1.0 to v11.2.1
• Facebook v12.3.1 to v13.0.0
• Firebase v8.11.0 to v8.13.0
• Fyber v8.1.2 to v8.1.4
• Kochava v5.1.0 to v5.1.1
• OneSignal v3.10.1 to v3.10.0
• Singular v11.0.3 to v11.0.4
• UnityAds v4.0.0 to v4.0.1

New pods

• IronSource v7.2.1

These pods were pushed to https://oss.sonatype.org/content/repositories/snapshots maven repo under 1.21.0-SNAPSHOTS version. Source code @github

Updates are not fully tested, please open issue if bug found.