fix: dead link in ARCHITECTURE.md

[cypherpepe]

Resolves #

Hi! I found a broken link in ARCHITECTURE.md - the current link to dbt-postgres points to the root of the dbt-adapters repo instead of the specific adapter directory. This could confuse new developers looking for the Postgres adapter source cod

Problem

...

Solution

Updated the link to point directly to the dbt-postgres directory within the dbt-adapters repo.

Checklist

• I have read the contributing guide and understand what's expected of me.
• I have run this code in development, and it appears to resolve the stated issue.
• This PR includes tests, or tests are not required or relevant for this PR.
• This PR has no interface changes (e.g., macros, CLI, logs, JSON artifacts, config files, adapter interface, etc.) or this PR has already received feedback and approval from Product or DX.
• This PR includes type annotations for new and modified functions.

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[QMalcolm]

Thank you for finding and fixing this! ❤️ One small grammatical issue we should probably fix as well 🙏

[QMalcolm]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[cypherpepe]

Hi @QMalcolm! Done

[QMalcolm]

Thanks again for doing this! 🚀

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.85%. Comparing base (e2e86b7) to head (2457122).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11475      +/-   ##
==========================================
- Coverage   88.91%   88.85%   -0.07%     
==========================================
  Files         194      194              
  Lines       24553    24553              
==========================================
- Hits        21832    21816      -16     
- Misses       2721     2737      +16     

Flag	Coverage Δ
integration	85.85% <ø> (-0.15%)	⬇️
unit	62.77% <ø> (+0.03%)	⬆️

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

Components	Coverage Δ
Unit Tests	62.77% <ø> (+0.03%)	⬆️
Integration Tests	85.85% <ø> (-0.15%)	⬇️

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