fix: do not import from src dir

[TimoGlastra]

Some files had src in their path meaning the files couldn't actually be found when published to NPM.

We should probably look to run the tests (at least the root tests) using the built files so we can make sure the npm version will work.

[codecov-commenter]

Codecov Report

Merging #748 (6300c9f) into main (5c80004) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #748   +/-   ##
=======================================
  Coverage   86.71%   86.71%           
=======================================
  Files         393      393           
  Lines        9207     9207           
  Branches     1622     1622           
=======================================
  Hits         7984     7984           
  Misses       1161     1161           
  Partials       62       62           

Impacted Files	Coverage Δ
...s/formats/models/CredentialFormatServiceOptions.ts	100.00% <ø> (ø)
...protocol/v1/handlers/V1ProposeCredentialHandler.ts	82.05% <ø> (ø)
...protocol/v1/handlers/V1RequestCredentialHandler.ts	97.67% <ø> (ø)
...ntials/formats/indy/IndyCredentialFormatService.ts	87.74% <100.00%> (ø)
...s/protocol/v1/handlers/V1IssueCredentialHandler.ts	92.59% <100.00%> (ø)
...s/protocol/v1/handlers/V1OfferCredentialHandler.ts	71.05% <100.00%> (ø)
...redentials/protocol/v2/CredentialMessageBuilder.ts	86.82% <100.00%> (ø)
...s/protocol/v2/handlers/V2IssueCredentialHandler.ts	93.10% <100.00%> (ø)
...s/protocol/v2/handlers/V2OfferCredentialHandler.ts	71.79% <100.00%> (ø)
...protocol/v2/handlers/V2RequestCredentialHandler.ts	94.44% <100.00%> (ø)

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