fix: track v1alpha2 versions (#58)

Author: chingor13

versions.txt

@@ -1,8 +1,10 @@
 # Format:
 # module:released-version:current-version
 
+proto-google-cloud-bigquerystorage-v1alpha2:0.86.0:0.86.1-SNAPSHOT
 proto-google-cloud-bigquerystorage-v1beta1:0.86.0:0.86.1-SNAPSHOT
 proto-google-cloud-bigquerystorage-v1beta2:0.86.0:0.86.1-SNAPSHOT
+grpc-google-cloud-bigquerystorage-v1alpha2:0.86.0:0.86.1-SNAPSHOT
 grpc-google-cloud-bigquerystorage-v1beta1:0.86.0:0.86.1-SNAPSHOT
 grpc-google-cloud-bigquerystorage-v1beta2:0.86.0:0.86.1-SNAPSHOT
 google-cloud-bigquerystorage:0.121.0-beta:0.121.1-beta-SNAPSHOT