deps: update dependency com.google.cloud:google-cloud-monitoring to v2.0.14

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.cloud:google-cloud-monitoring	2.0.13 -> 2.0.14

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[codecov]

Codecov Report

Merging #919 (fdb15e8) into master (aca9d45) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #919      +/-   ##
============================================
- Coverage     85.22%   85.22%   -0.01%     
+ Complexity     2652     2650       -2     
============================================
  Files           145      145              
  Lines         14358    14358              
  Branches       1391     1391              
============================================
- Hits          12237    12236       -1     
- Misses         1539     1541       +2     
+ Partials        582      581       -1     

Impacted Files	Coverage Δ	Complexity Δ
...ain/java/com/google/cloud/spanner/SessionPool.java	89.07% <0.00%> (-0.20%)	72.00% <0.00%> (-1.00%)
...a/com/google/cloud/spanner/SessionPoolOptions.java	69.53% <0.00%> (ø)	17.00% <0.00%> (-1.00%)
...m/google/cloud/spanner/connection/SpannerPool.java	87.89% <0.00%> (+0.52%)	33.00% <0.00%> (ø%)

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