Switch version from function to string in otelaws

[jongwooo]

Change Version() func to const Version string in otelaws

Part of #8272

[dmathieu]

This needs a changelog entry.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.3%. Comparing base (bdd9e3a) to head (8a57641).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #8356     +/-   ##
=======================================
- Coverage   82.3%   82.3%   -0.1%     
=======================================
  Files        190     189      -1     
  Lines      13773   13771      -2     
=======================================
- Hits       11338   11336      -2     
  Misses      2030    2030             
  Partials     405     405             

Files with missing lines	Coverage Δ
...tation/github.com/aws/aws-sdk-go-v2/otelaws/aws.go	97.5% <100.0%> (ø)

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