deps: update core transport dependencies to v1.34.2

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.http-client:google-http-client	patch	1.34.1 -> 1.34.2
com.google.http-client:google-http-client-jackson2	patch	1.34.1 -> 1.34.2

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[codecov]

Codecov Report

Merging #168 into master will increase coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #168      +/-   ##
============================================
+ Coverage     77.37%   77.44%   +0.07%     
  Complexity     1110     1110              
============================================
  Files            73       73              
  Lines          5922     5932      +10     
  Branches        635      645      +10     
============================================
+ Hits           4582     4594      +12     
- Misses         1011     1013       +2     
+ Partials        329      325       -4

Impacted Files	Coverage Δ	Complexity Δ
.../google/cloud/bigquery/spi/v2/HttpBigQueryRpc.java	5.2% <0%> (-0.04%)	2% <0%> (ø)
...google/cloud/bigquery/StandardTableDefinition.java	93.9% <0%> (+0.15%)	16% <0%> (ø)	⬇️
...n/java/com/google/cloud/bigquery/BigQueryImpl.java	67.01% <0%> (+0.17%)	58% <0%> (ø)	⬇️
...src/main/java/com/google/cloud/bigquery/Field.java	82.79% <0%> (+0.18%)	25% <0%> (ø)	⬇️
...m/google/cloud/bigquery/QueryJobConfiguration.java	77.14% <0%> (+0.28%)	56% <0%> (ø)	⬇️
...a/com/google/cloud/bigquery/InsertAllResponse.java	89.18% <0%> (+0.3%)	15% <0%> (ø)	⬇️
...om/google/cloud/bigquery/LoadJobConfiguration.java	90.15% <0%> (+0.47%)	52% <0%> (ø)	⬇️
...ogle/cloud/bigquery/WriteChannelConfiguration.java	86.12% <0%> (+0.61%)	44% <0%> (ø)	⬇️

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