Upgrade to proto 3.21.8
Upgrade to proto 3.21.8

Bug: 255753711
Test: ./gradlew tasks

Change-Id: I22847dccb84f2e8f870c59602f6c8317f298c35f

AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx