chore(deps): update dependency com.google.cloud:libraries-bom to v6

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.cloud:libraries-bom	major	5.7.0 -> 6.0.0

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[codecov]

Codecov Report

Merging #455 into master will decrease coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #455      +/-   ##
============================================
- Coverage     81.36%   81.29%   -0.07%     
  Complexity     1225     1225              
============================================
  Files            77       77              
  Lines          6218     6208      -10     
  Branches        691      681      -10     
============================================
- Hits           5059     5047      -12     
+ Misses          802      800       -2     
- Partials        357      361       +4     

Impacted Files	Coverage Δ	Complexity Δ
...ogle/cloud/bigquery/WriteChannelConfiguration.java	86.23% <0.00%> (-0.58%)	46.00% <0.00%> (ø%)
...om/google/cloud/bigquery/LoadJobConfiguration.java	92.77% <0.00%> (-0.44%)	56.00% <0.00%> (ø%)
...a/com/google/cloud/bigquery/InsertAllResponse.java	88.88% <0.00%> (-0.31%)	15.00% <0.00%> (ø%)
...m/google/cloud/bigquery/QueryJobConfiguration.java	89.80% <0.00%> (-0.28%)	66.00% <0.00%> (ø%)
...google/cloud/bigquery/StandardTableDefinition.java	93.15% <0.00%> (-0.19%)	16.00% <0.00%> (ø%)
...n/java/com/google/cloud/bigquery/BigQueryImpl.java	83.42% <0.00%> (-0.18%)	74.00% <0.00%> (ø%)
...src/main/java/com/google/cloud/bigquery/Field.java	83.33% <0.00%> (-0.17%)	27.00% <0.00%> (ø%)
.../google/cloud/bigquery/spi/v2/HttpBigQueryRpc.java	5.23% <0.00%> (+0.03%)	2.00% <0.00%> (ø%)

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