chore: retry staging portion of the release

[chingor13]

Towards googleapis/java-cloud-bom#1241

[generated-files-bot]

Warning: This pull request is touching the following templated files:

• .kokoro/release/stage.sh

[codecov]

Codecov Report

Merging #299 (5d9e0c0) into master (f3dde1a) will decrease coverage by 0.40%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #299      +/-   ##
============================================
- Coverage     81.91%   81.50%   -0.41%     
+ Complexity      202      176      -26     
============================================
  Files             7        7              
  Lines          1570     1465     -105     
  Branches          3        3              
============================================
- Hits           1286     1194      -92     
+ Misses          282      269      -13     
  Partials          2        2              

Impacted Files	Coverage Δ	Complexity Δ
...loud/container/v1/stub/GrpcClusterManagerStub.java	98.41% <0.00%> (-0.15%)	38.00% <0.00%> (-1.00%)
.../container/v1/stub/ClusterManagerStubSettings.java	86.12% <0.00%> (-0.15%)	41.00% <0.00%> (-1.00%)
...oogle/cloud/container/v1/ClusterManagerClient.java	76.14% <0.00%> (+1.14%)	91.00% <0.00%> (-24.00%)	⬆️

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