Re-enable TLSv1.1/1.2 support

Was disabled in 3fd7470d.

Issue 6238.

Related Android change for API 20:
https://android.googlesource.com/platform/external/conscrypt/+/1f63d2c22326b989105366d2907a83b848dcd29e%5E!/
Update changelog for 4.905
Bumped manifest to 4.905
Update changelog for 5.000 RC1
Bumped manifest to 5.000 RC1