Change version to 1.71.1

[purnesh42H]

RELEASE NOTES: None

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.38%. Comparing base (8d46b21) to head (370203d).
Report is 4 commits behind head on v1.71.x.

Additional details and impacted files

@@             Coverage Diff             @@
##           v1.71.x    #8205      +/-   ##
===========================================
- Coverage    82.39%   82.38%   -0.01%     
===========================================
  Files          387      387              
  Lines        38962    38959       -3     
===========================================
- Hits         32101    32097       -4     
- Misses        5555     5559       +4     
+ Partials      1306     1303       -3     

Files with missing lines	Coverage Δ
stats/opentelemetry/client_tracing.go	76.47% <100.00%> (ø)
stats/opentelemetry/server_tracing.go	100.00% <100.00%> (ø)
xds/internal/xdsclient/clientimpl.go	79.57% <100.00%> (-0.51%)	⬇️
xds/internal/xdsclient/pool.go	81.08% <100.00%> (+1.66%)	⬆️

... and 27 files with indirect coverage changes

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[arjan-bal]

Approved the other PR: #8206