downgrade google-api-client to unblock release

[elefeint]

An actual solution is available in google-api-client:1.30., but it seems safer to roll back.
We can upgrade bom properly later.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #2236 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master   #2236      +/-   ##
===========================================
+ Coverage     72.57%   72.6%   +0.02%     
  Complexity     2011    2011              
===========================================
  Files           258     258              
  Lines          7370    7370              
  Branches        757     757              
===========================================
+ Hits           5349    5351       +2     
+ Misses         1674    1672       -2     
  Partials        347     347

Flag	Coverage Δ	Complexity Δ
#integration	?	?
#unittests	72.6% <ø> (+0.02%)	2011 <ø> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
...tastore/GcpDatastoreEmulatorAutoConfiguration.java	72.41% <0%> (+6.89%)	6% <0%> (ø)	⬇️

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