build: update maven config to use autovalue from shared-config

[BenWhitehead]

This is expected to not build since it's pointing at a snapshot of shared-config.

But it is illustrative of what the usage of the auto-value profile(s) from shared config look like.

Related to: googleapis/java-shared-config#136

[codecov]

Codecov Report

Merging #221 into master will decrease coverage by 0.08%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #221      +/-   ##
============================================
- Coverage     72.94%   72.85%   -0.09%     
+ Complexity     1026     1015      -11     
============================================
  Files            63       63              
  Lines          5407     5394      -13     
  Branches        615      611       -4     
============================================
- Hits           3944     3930      -14     
+ Misses         1266     1265       -1     
- Partials        197      199       +2     

Impacted Files	Coverage Δ	Complexity Δ
...oogle/cloud/firestore/v1/FirestoreAdminClient.java	58.26% <0.00%> (-1.58%)	38.00% <0.00%> (ø%)
...a/com/google/cloud/firestore/FirestoreOptions.java	36.44% <0.00%> (-0.54%)	7.00% <0.00%> (ø%)
...rc/main/java/com/google/cloud/firestore/Query.java	90.80% <0.00%> (-0.17%)	105.00% <0.00%> (-7.00%)
...rc/main/java/com/google/cloud/firestore/Watch.java	91.55% <0.00%> (-0.12%)	56.00% <0.00%> (ø%)
...restore/collection/ImmutableSortedMapIterator.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)

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