chore(deps): update dependency com.google.cloud:libraries-bom to v20.1.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.cloud:libraries-bom	20.0.0 -> 20.1.0

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[codecov]

Codecov Report

Merging #1069 (052c1d9) into master (2f6fe5e) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1069   +/-   ##
=========================================
  Coverage     85.26%   85.26%           
+ Complexity     2663     2662    -1     
=========================================
  Files           155      155           
  Lines         14448    14448           
  Branches       1362     1362           
=========================================
  Hits          12319    12319           
  Misses         1561     1561           
  Partials        568      568           

Impacted Files	Coverage Δ	Complexity Δ
...ud/spanner/SessionPoolAsyncTransactionManager.java	85.71% <0.00%> (-1.51%)	12.00% <0.00%> (-2.00%)
...ain/java/com/google/cloud/spanner/SessionPool.java	89.32% <0.00%> (+0.19%)	73.00% <0.00%> (ø%)

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