vcpkg.json: Go back to the same commit for builtin-baseline as was used for vcpkgGitCommitId prior to this PR

Author: stephengtuggy

vcpkg.json

@@ -2,7 +2,7 @@
   "$schema": "https://raw.githubusercontent.com/microsoft/vcpkg/master/scripts/vcpkg.schema.json",
   "name": "boost-python",
   "version-string": "1.91.0",
-  "builtin-baseline": "d015e31e90838a4c9dfa3eed45979bc70d9357fc",
+  "builtin-baseline": "88b1071e39f13b632644d9d953738d345a4ac055",
   "dependencies": [
     "boost-config",
     "boost-core",