nginx: bump main version to 1.29.6

Author: chinkung

nginx-mainline.yaml

@@ -2,7 +2,7 @@ package:
   name: nginx-mainline
   # MAINLINE VERSIONS MUST USE ODD MINOR VERSIONS (e.g., 1.27.x, 1.29.x)
   # Must also bump njs at the same time
-  version: "1.29.5"
+  version: "1.29.6"
   epoch: 0 # go/wolfi-rsc/nginx-mainline
   # HEY YOU! If you update/bump this package you NEED to go and update the equivilent nginx-otel package
   description: HTTP and reverse proxy server (mainline version)
@@ -78,7 +78,7 @@ pipeline:
     with:
       repository: https://github.com/nginx/nginx.git
       tag: release-${{package.version}}
-      expected-commit: 1f57d8dc9d386b46ba7e156e25345b70843e7f55
+      expected-commit: cb85fbbfbad6adf5ce71ed4f9b585f498c05c19d
       destination: nginx-mainline
 
   - uses: git-checkout