chore(deps): update protobuf packages to v3.11.0

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.protobuf:protobuf-java	minor	3.10.0 -> 3.11.0
com.google.protobuf:protobuf-java-util	minor	3.10.0 -> 3.11.0

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[codecov]

Codecov Report

Merging #26 into master will increase coverage by 0.26%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #26      +/-   ##
============================================
+ Coverage     70.95%   71.22%   +0.26%     
- Complexity      950      981      +31     
============================================
  Files            62       62              
  Lines          5196     5300     +104     
  Branches        584      592       +8     
============================================
+ Hits           3687     3775      +88     
- Misses         1333     1337       +4     
- Partials        176      188      +12

Impacted Files	Coverage Δ	Complexity Δ
...oogle/cloud/firestore/v1/FirestoreAdminClient.java	58.26% <0%> (-5.53%)	38% <0%> (+8%)
...a/com/google/cloud/firestore/FirestoreOptions.java	36.44% <0%> (-0.54%)	7% <0%> (ø)
.../com/google/cloud/firestore/CustomClassMapper.java	77.29% <0%> (-0.14%)	102% <0%> (ø)
...rc/main/java/com/google/cloud/firestore/Watch.java	91.81% <0%> (-0.11%)	57% <0%> (ø)
...rc/main/java/com/google/cloud/firestore/Query.java	91.79% <0%> (-0.05%)	94% <0%> (ø)
...oogle/cloud/firestore/spi/v1/GrpcFirestoreRpc.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
...restore/collection/ImmutableSortedMapIterator.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
.../com/google/cloud/firestore/UserDataConverter.java	94.93% <0%> (+0.06%)	23% <0%> (ø)	⬇️
.../firestore/v1/stub/FirestoreAdminStubSettings.java	80.87% <0%> (+0.31%)	19% <0%> (+1%)	⬆️
...cloud/firestore/v1/stub/FirestoreStubSettings.java	79.63% <0%> (+0.37%)	23% <0%> (+1%)	⬆️
... and 9 more

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[BenWhitehead]

• Kokoro - Test: Dependencies failing due to existing animal-sniffer-annotations miss-match.
• Kokoro - Test: Binary Compatibility is failing due to 180f5a9 where clirr isn't comfortable with a method parameter widening (it see it as a removal and an add)