Test: touch fields_string.go so everything is rebuilt in codegen verification

[jannotti]

Since we commit some products of the make, but our goal is to ensure those products are exactly what would be generated, we have to force the generation to actually happen.

[codecov]

Codecov Report

Merging #4330 (21b74ba) into master (09607f1) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4330      +/-   ##
==========================================
- Coverage   55.26%   55.25%   -0.02%     
==========================================
  Files         395      395              
  Lines       50334    50334              
==========================================
- Hits        27818    27811       -7     
- Misses      20131    20137       +6     
- Partials     2385     2386       +1     

Impacted Files	Coverage Δ
util/db/dbutil.go	49.09% <0.00%> (-1.22%)	⬇️
data/transactions/verify/txn.go	44.00% <0.00%> (-0.89%)	⬇️
ledger/tracker.go	76.29% <0.00%> (-0.87%)	⬇️
catchup/service.go	68.64% <0.00%> (-0.25%)	⬇️
network/wsNetwork.go	64.70% <0.00%> (-0.20%)	⬇️
network/wsPeer.go	68.21% <0.00%> (+0.54%)	⬆️

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[michaeldiamant]

@jannotti Thanks for looking into it!

For other folks looking in, the PR ought to address failures like https://app.circleci.com/pipelines/github/algorand/go-algorand/8121/workflows/62a49324-75d4-4f08-8252-ca022937e119/jobs/145986.