GH-1340: Bump vcpkg to 2026.07.29

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Author: jbonofre

.env

@@ -53,7 +53,7 @@ MAVEN=3.9.9
 # Versions for various dependencies used to build artifacts
 # Keep in sync with apache/arrow
 ARROW_REPO_ROOT=./arrow
-VCPKG="9b965a116838c6cdcd36bca60d1b81b030c8ab8d"    # 2026.05.27 (not release, upstream commit)
+VCPKG="9e593bb18ea69cc5095e012465dcd675a822ed0d"    # 2026.07.29
 
 # Revision of the vcpkg-jni image. The image is tagged with VCPKG only
 # otherwise, so bump this when the base image (apache/arrow's cpp-jni) changes