[python3] Add libb2 as a dependency when the extensions feature is enabled (#49933)

Co-authored-by: Ccp Toebeans <ccptoebeans>

ports/python3/vcpkg.json

@@ -1,7 +1,7 @@
 {
   "name": "python3",
   "version": "3.12.9",
-  "port-version": 8,
+  "port-version": 9,
   "description": "The Python programming language",
   "homepage": "https://github.com/python/cpython",
   "license": "Python-2.0",
@@ -66,6 +66,7 @@
           "name": "expat",
           "default-features": false
         },
+        "libb2",
         {
           "name": "libffi",
           "default-features": false

versions/baseline.json

@@ -7914,7 +7914,7 @@
     },
     "python3": {
       "baseline": "3.12.9",
-      "port-version": 8
+      "port-version": 9
     },
     "qca": {
       "baseline": "2.3.7",

versions/p-/python3.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "14cafa1ccb9853a25bbe2f0a7a7070bcb569c58b",
+      "version": "3.12.9",
+      "port-version": 9
+    },
     {
       "git-tree": "8d3b3ef309a4fd7c53561374aa746e6eafed6517",
       "version": "3.12.9",