v1.x: Fix peer dependency range syntax for firebase-admin

[kmjennison]

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[codecov]

Codecov Report

Merging #357 (786358b) into v1.x (7b8fff2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             v1.x     #357   +/-   ##
=======================================
  Coverage   99.59%   99.59%           
=======================================
  Files          25       25           
  Lines         495      495           
  Branches      176      176           
=======================================
  Hits          493      493           
  Misses          2        2           

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