Bump to guava 20

[Will-Lo]

Dear Gobblin maintainers,

Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below!

JIRA

• My PR addresses the following Gobblin JIRA issues and references them in the PR title. For example, "[GOBBLIN-XXX] My Gobblin PR"
  • https://issues.apache.org/jira/browse/GOBBLIN-XXX

Description

• Here are some details about my PR, including screenshots (if applicable):

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:

Commits

• My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

[codecov-commenter]

Codecov Report

Patch coverage: 51.05% and project coverage change: +0.27 🎉

Comparison is base (34c20ff) 46.58% compared to head (7414354) 46.85%.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master      #24      +/-   ##
============================================
+ Coverage     46.58%   46.85%   +0.27%     
- Complexity    10669    10758      +89     
============================================
  Files          2133     2139       +6     
  Lines         83491    84030     +539     
  Branches       9281     9335      +54     
============================================
+ Hits          38893    39374     +481     
- Misses        41039    41073      +34     
- Partials       3559     3583      +24     

Impacted Files	Coverage Δ
...pache/gobblin/configuration/ConfigurationKeys.java	0.00% <ø> (ø)
.../apache/gobblin/aws/GobblinAWSClusterLauncher.java	70.47% <ø> (+70.47%)	⬆️
...obblin/data/management/copy/CopyConfiguration.java	86.95% <ø> (ø)
...ta/management/copy/ManifestBasedDatasetFinder.java	80.00% <ø> (ø)
...ta/management/copy/iceberg/BaseIcebergCatalog.java	0.00% <0.00%> (ø)
...management/copy/iceberg/IcebergCatalogFactory.java	0.00% <0.00%> (ø)
.../management/copy/iceberg/IcebergDatasetFinder.java	0.00% <0.00%> (ø)
...ta/management/copy/iceberg/IcebergHiveCatalog.java	0.00% <0.00%> (ø)
...lin/data/management/copy/iceberg/IcebergTable.java	71.87% <0.00%> (-11.77%)	⬇️
...management/partition/CopyableDatasetRequestor.java	35.48% <0.00%> (ø)
... and 76 more

... and 25 files with indirect coverage changes

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