chore: bump apisix-nginx-module to 1.19.7

[jarvis9443]

Bumps the default apisix_nginx_module_ver in build-apisix-runtime.sh from 1.19.6 to 1.19.7, so the next apisix-runtime release compiles against apisix-nginx-module 1.19.7.

1.19.7 adds the two fixes merged on top of 1.19.6:

• fix: restore missing max_body_size guard for chunked body in 1.29.2.4 patch (client_max_body_size 0 wrongly 413s chunked) apisix-nginx-module#115 — restore the missing max_body_size guard for chunked request bodies in the OpenResty 1.29.2.4 patch. This fixes bug: # APISIX 3.16 → 3.17 Chunked POST Regression apache/apisix#13673, where chunked-transfer POST requests are wrongly rejected with 413 (regression on 3.17.0 vs 3.16.0).
• fix: address OpenResty 1.29 compatibility regressions apisix-nginx-module#116 — address OpenResty 1.29 compatibility regressions.

Both regressions live only in the 1.29.2.4 patch, so this affects the apisix-runtime line only (api7ee-runtime on OpenResty 1.21 is unaffected).

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📥 Commits

Reviewing files that changed from the base of the PR and between 60fc95b and 2383890.

📒 Files selected for processing (1)

• build-apisix-runtime.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bump-apisix-nginx-module-1.19.7

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