Bump auto-value to 1.6.2
Bump auto-value to 1.6.2

The update is needed to fix Eclipse-Oxygen with Java 9 breakage: [1]. The
new release contains this fix: [2].

[1] https://github.com/google/auto/issues/645
[2] https://github.com/google/auto/pull/646

Change-Id: Ib97db15226f2ed0c9b680567d285339743e83128

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