deps: update dependency com.google.cloud:google-cloud-trace to v1.2.8

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.cloud:google-cloud-trace	patch	1.2.7 -> 1.2.8

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[codecov]

Codecov Report

Merging #699 (d4ac33b) into master (caf174c) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #699      +/-   ##
============================================
- Coverage     85.05%   85.03%   -0.02%     
+ Complexity     2556     2554       -2     
============================================
  Files           142      142              
  Lines         13930    13930              
  Branches       1326     1326              
============================================
- Hits          11848    11846       -2     
- Misses         1526     1527       +1     
- Partials        556      557       +1     

Impacted Files	Coverage Δ	Complexity Δ
...ud/spanner/SessionPoolAsyncTransactionManager.java	85.36% <0.00%> (-1.63%)	11.00% <0.00%> (-2.00%)

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