Refactor macdeploycheck installation and update Brewfile tap path

This commit modifies the `macdeploycheck` formula to install the script directly from the tapped repository instead of using a local file URL. Additionally, the `Brewfile` is updated to use the directory of the Brewfile for the tap path, ensuring compatibility when running `brew bundle` from different locations. The `install_brew_deps.sh` script is also enhanced to provide more detailed error messages when missing formulae are detected.

build_tools/macos/install_brew_deps.sh

@@ -96,6 +96,8 @@ run_with_heartbeat "Refreshing strawberry/local tap clone" bash -lc '
 for f in kdsingleapplication-qt6 qtsparkle-qt6 sparkle-framework libgpod macdeploycheck; do
   if ! brew info "strawberry/local/${f}" >/dev/null 2>&1; then
     echo "Error: Missing formula strawberry/local/${f} in the tapped repo." >&2
+    echo "Details (brew info):" >&2
+    brew info "strawberry/local/${f}" >&2 || true
     echo "If you recently added/changed formulae, ensure they are committed, then refresh the tap:" >&2
     echo "  git -C \"$(brew --repo strawberry/local)\" pull --ff-only" >&2
     exit 1