chore(deps): update dependency com.google.cloud:libraries-bom to v19.2.1

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.cloud:libraries-bom	19.1.0 -> 19.2.1

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[codecov]

Codecov Report

Merging #397 (0ec7c99) into master (cf3f2d8) will increase coverage by 0.66%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #397      +/-   ##
============================================
+ Coverage     80.30%   80.96%   +0.66%     
  Complexity      455      455              
============================================
  Files            18       18              
  Lines          2848     2848              
  Branches          9       28      +19     
============================================
+ Hits           2287     2306      +19     
  Misses          454      454              
+ Partials        107       88      -19     

Impacted Files	Coverage Δ	Complexity Δ
...va/com/google/cloud/tasks/v2/CloudTasksClient.java	76.26% <0.00%> (+2.52%)	86.00% <0.00%> (ø%)
...m/google/cloud/tasks/v2beta3/CloudTasksClient.java	76.26% <0.00%> (+2.52%)	86.00% <0.00%> (ø%)
...m/google/cloud/tasks/v2beta2/CloudTasksClient.java	79.60% <0.00%> (+3.59%)	110.00% <0.00%> (ø%)

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