#2582: Fix ClassCastEx in PubSubIO

[jto]

fixes #2582

[codecov]

Codecov Report

Merging #2583 into master will increase coverage by 0.17%.
The diff coverage is 60%.

@@            Coverage Diff             @@
##           master    #2583      +/-   ##
==========================================
+ Coverage   68.23%   68.41%   +0.17%     
==========================================
  Files         207      207              
  Lines        7254     7254              
  Branches      349      354       +5     
==========================================
+ Hits         4950     4963      +13     
+ Misses       2304     2291      -13

Impacted Files	Coverage Δ
.../src/main/scala/com/spotify/scio/VersionUtil.scala	75.67% <0%> (ø)	⬆️
.../src/main/scala/com/spotify/scio/io/PubsubIO.scala	31.25% <100%> (+10%)	⬆️
...main/scala/com/spotify/scio/util/BloomFilter.scala	94.2% <0%> (+0.72%)	⬆️
...scala/com/spotify/scio/extra/sparkey/package.scala	75.82% <0%> (+1.09%)	⬆️
...y/scio/values/PairSkewedSCollectionFunctions.scala	93.75% <0%> (+3.12%)	⬆️
...spotify/scio/coders/instances/BeamTypeCoders.scala	100% <0%> (+14.28%)	⬆️

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[regadas]

@jto can you rebase I fix the formatting in master.

[regadas]

scratch that i see that you fixed it here as well 😄

[regadas]

@jto outside of this PR; but it seems that the only classes that need ClassTag are AvroPubsubIOWithoutAttributes & MessagePubsubIOWithoutAttributes or am I missing smth?