fix: Prevent infinite loop in update_payment_method logic

[spalmurray-codecov]

Fixes infinite loop introduced in #630 which has meant us spamming the Stripe API constantly.

[codecov-staging]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

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[codecov-qa]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.54%. Comparing base (92dd89f) to head (df39c79).

✅ All tests successful. No failed tests found.

@@           Coverage Diff           @@
##             main     #657   +/-   ##
=======================================
  Coverage   91.54%   91.54%           
=======================================
  Files         621      621           
  Lines       16572    16572           
=======================================
  Hits        15171    15171           
  Misses       1401     1401           

Flag	Coverage Δ
unit	91.54% <100.00%> (ø)
unit-latest-uploader	91.54% <100.00%> (ø)

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Files	Coverage Δ
billing/views.py	97.01% <100.00%> (ø)

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[codecov-public-qa]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.54%. Comparing base (92dd89f) to head (df39c79).

✅ All tests successful. No failed tests found ☺️

@@           Coverage Diff           @@
##             main     #657   +/-   ##
=======================================
  Coverage   91.54%   91.54%           
=======================================
  Files         621      621           
  Lines       16572    16572           
=======================================
  Hits        15171    15171           
  Misses       1401     1401           

Flag	Coverage Δ
unit	91.54% <100.00%> (ø)
unit-latest-uploader	91.54% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
billing/views.py	97.01% <100.00%> (ø)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.94%. Comparing base (92dd89f) to head (df39c79).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##               main       #657   +/-   ##
===========================================
  Coverage   95.94000   95.94000           
===========================================
  Files           799        799           
  Lines         17889      17889           
===========================================
  Hits          17163      17163           
  Misses          726        726           

Flag	Coverage Δ
unit	91.54% <100.00%> (ø)
unit-latest-uploader	91.54% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

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