remove old todos for 2.68 and gax

[derrickaw]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.06%. Comparing base (6746f45) to head (5ff6d20).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2887      +/-   ##
============================================
- Coverage     50.07%   50.06%   -0.01%     
- Complexity     4969     5345     +376     
============================================
  Files           967      967              
  Lines         59298    59298              
  Branches       6441     6441              
============================================
- Hits          29692    29688       -4     
- Misses        27501    27505       +4     
  Partials       2105     2105              

Components	Coverage Δ
spanner-templates	70.48% <ø> (-0.01%)	⬇️
spanner-import-export	69.06% <ø> (-0.02%)	⬇️
spanner-live-forward-migration	79.69% <ø> (ø)
spanner-live-reverse-replication	77.42% <ø> (ø)
spanner-bulk-migration	88.21% <ø> (ø)
see 2 files with indirect coverage changes

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