fix(deps): update module cloud.google.com/go/spanner to v1.49.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
cloud.google.com/go/spanner	require	minor	v1.48.0 -> v1.49.0

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[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (1ece125) 76.11% compared to head (c20f49c) 76.11%.

❗ Current head c20f49c differs from pull request most recent head cf754ac. Consider uploading reports for the commit cf754ac to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #319   +/-   ##
=======================================
  Coverage   76.11%   76.11%           
=======================================
  Files          28       28           
  Lines        1005     1005           
=======================================
  Hits          765      765           
  Misses        178      178           
  Partials       62       62           

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