Firestore: Cleanup unused dependencies

[athakor]

towards #4383

[codecov]

Codecov Report

Merging #5639 into master will increase coverage by 0.55%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #5639 +/- ##
============================================
+ Coverage 46.71% 47.26% +0.55% - Complexity 24629 30217 +5588 
============================================
Files 2351 2456 +105 Lines 256127 305276 +49149 Branches 29325 34809 +5484 ============================================
+ Hits 119642 144284 +24642 - Misses 127565 151184 +23619 - Partials 8920 9808 +888

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/com/google/cloud/bigquery/BigQuery.java	73.3% <0%> (-5.14%)	0% <0%> (ø)
...va/com/google/cloud/storage/spi/v1/StorageRpc.java	57.95% <0%> (-4.91%)	0% <0%> (ø)
...google/cloud/compute/v1/InsertDiskHttpRequest.java	19.77% <0%> (-4.66%)	13% <0%> (+3%)
.../cloud/compute/v1/InsertRegionDiskHttpRequest.java	19.77% <0%> (-4.66%)	13% <0%> (+3%)
...pute/v1/InsertInstanceGroupManagerHttpRequest.java	19.83% <0%> (-3.95%)	11% <0%> (+2%)
...pute/v1/InsertGlobalForwardingRuleHttpRequest.java	20% <0%> (-3.93%)	11% <0%> (+2%)
...ud/compute/v1/InsertForwardingRuleHttpRequest.java	20% <0%> (-3.93%)	11% <0%> (+2%)
...1/InsertRegionInstanceGroupManagerHttpRequest.java	19.91% <0%> (-3.87%)	11% <0%> (+2%)
...oud/compute/v1/InsertInstanceGroupHttpRequest.java	20.08% <0%> (-3.85%)	12% <0%> (+3%)
...oud/compute/v1/InsertBackendBucketHttpRequest.java	20.08% <0%> (-3.85%)	12% <0%> (+3%)
... and 640 more

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