deps: bump Spanner to 6.25

[olavloite]

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[codecov]

Codecov Report

Merging #161 (6f3d649) into postgresql-dialect (c98898d) will increase coverage by 0.30%.
The diff coverage is n/a.

@@                   Coverage Diff                    @@
##             postgresql-dialect     #161      +/-   ##
========================================================
+ Coverage                 77.98%   78.29%   +0.30%     
  Complexity                  854      854              
========================================================
  Files                        82       82              
  Lines                      2921     2921              
  Branches                    310      310              
========================================================
+ Hits                       2278     2287       +9     
+ Misses                      508      499       -9     
  Partials                    135      135              

Flag	Coverage Δ
all_tests	78.29% <ø> (+0.30%)	⬆️

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Impacted Files	Coverage Δ
...gle/cloud/spanner/pgadapter/ConnectionHandler.java	79.59% <0.00%> (+4.59%)	⬆️

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