fix: add BetaApi tag to setLogicalTimeout

[noahdietz]

I forgot to add the @BetaApi annotation to the new RetrySettings.Builder.setLogicalTimeout helper in #1334 .

[codecov]

Codecov Report

Merging #1335 (5891c5d) into master (97d3214) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1335   +/-   ##
=========================================
  Coverage     80.53%   80.53%           
  Complexity     1331     1331           
=========================================
  Files           210      210           
  Lines          5686     5686           
  Branches        519      519           
=========================================
  Hits           4579     4579           
  Misses          895      895           
  Partials        212      212           

Impacted Files	Coverage Δ	Complexity Δ
...ava/com/google/api/gax/retrying/RetrySettings.java	55.76% <ø> (ø)	2.00 <0.00> (ø)

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