Bump guava from 15.0 to 23.0

[dependabot-preview]

Bumps guava from 15.0 to 23.0.

Release notes

Sourced from guava's releases.

23.0

Final Guava 23.0 release.

23.0-rc1

First Guava 23.0 release candidate.

22.0

Final Guava 22.0 release.

22.0-rc1

First release candidate for Guava 22.0.

21.0

Final Guava 21.0 release.

This release requires Java 8.

21.0-rc2

Second release candidate for Guava 21.0.

This release candidate fixes a small issue with rc1; a number of methods that create Collectors took Guava's functional types (e.g. base.Function) as parameters rather than the java.util.function equivalent.

This release requires Java 8.

21.0-rc1

First release candidate for Guava 21.0.

This release requires Java 8.

20.0

Final Guava 20.0 release.

20.0-rc1

First release candidate for Guava 20.0.

Commits

• b48cdeb Set version numbers to 23.0
• 6dae21f Remove some methods that are scheduled for removal in 23.0, along with one th...
• 22da091 Rollforward [] which was rolled back in [] because it
• b87e1f1 Automated g4 rollback of changelist 162220754.
• 44b9081 Set version numbers to 23.0-rc1
• ee12894 Implement ByteSource.asCharSource(charset).read() using the decoding string c...
• 71b5b85 Add submitAsync and scheduleAsync methods, to ease the deprecation of Futures...
• b6c86db Short-circuit null check in Throwables#lazyStackTraceIsLazy
• dd78480 Update Public Suffix List.
• 1d7f652 Add SafeVarargs to Predicates.and(Predicate<? super T>...).
• Additional commits viewable in compare view

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