feat: add v20.19.6 patch (#133)

## Node.js Patch Update to v20.19.6

This PR updates the Node.js patch to version 20.19.6.

The workflow automatically attempts to resolve patch conflicts using AI
when the OpenAI API key is available.

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

patches/node.v20.19.5.cpp.patch renamed to patches/node.v20.19.6.cpp.patch

@@ -1,5 +1,5 @@
 diff --git node/common.gypi node/common.gypi
-index 20e81dea95..3580f7f2e4 100644
+index 311b203600..b2ee8cb47d 100644
 --- node/common.gypi
 +++ node/common.gypi
 @@ -187,7 +187,7 @@
@@ -392,7 +392,7 @@ index 1137dcafcd..482feb65b5 100644
    }
 
 diff --git node/src/node_contextify.cc node/src/node_contextify.cc
-index 2b93926a73..9f68232bd4 100644
+index 2331579b26..f84681ae02 100644
 --- node/src/node_contextify.cc
 +++ node/src/node_contextify.cc
 @@ -79,6 +79,7 @@ using v8::String;

patches/patches.json

@@ -1,7 +1,7 @@
 {
   "v24.11.1": ["node.v24.11.1.cpp.patch"],
   "v22.21.1": ["node.v22.21.1.cpp.patch"],
-  "v20.19.5": ["node.v20.19.5.cpp.patch"],
+  "v20.19.6": ["node.v20.19.6.cpp.patch"],
   "v18.20.8": ["node.v18.20.8.cpp.patch"],
   "v16.20.2": ["node.v16.20.2.cpp.patch"],
   "v14.21.3": ["node.v14.21.3.cpp.patch"],