Update distribution-scripts (#16301)

Updates `distribution-scripts` dependency to crystal-lang/distribution-scripts@54d475d

This includes the following changes:

* crystal-lang/distribution-scripts#381
* crystal-lang/distribution-scripts#382
* crystal-lang/distribution-scripts#378
* crystal-lang/distribution-scripts#380
* crystal-lang/distribution-scripts#379
* crystal-lang/distribution-scripts#374
* crystal-lang/distribution-scripts#372
* crystal-lang/distribution-scripts#373
* crystal-lang/distribution-scripts#370
* crystal-lang/distribution-scripts#366
* crystal-lang/distribution-scripts#357
* crystal-lang/distribution-scripts#353
* crystal-lang/distribution-scripts#356
* crystal-lang/distribution-scripts#352
* crystal-lang/distribution-scripts#351

Also updates Xcode to 16.4 becaus 15.3 is deprecated: [circleci.com/changelog/deprecation-of-eol-xcode-versions](https://circleci.com/changelog/deprecation-of-eol-xcode-versions/)

Author: straight-shoota

.circleci/config.yml

@@ -8,7 +8,7 @@ parameters:
   distribution-scripts-version:
     description: "Git ref for version of https://github.com/crystal-lang/distribution-scripts/"
     type: string
-    default: "1ee31a42f0b06776a42fa4635b54dc9ec567e68a"
+    default: "54d475d5f39dc6c95002683e5258cf8f83ca7415"
   previous_crystal_base_url:
     description: "Prefix for URLs to Crystal bootstrap compiler"
     type: string
@@ -81,7 +81,7 @@ jobs:
 
   test_darwin:
     macos:
-      xcode: 15.4.0
+      xcode: 16.4.0
     environment:
       <<: *env
       TRAVIS_OS_NAME: osx
@@ -285,7 +285,7 @@ jobs:
 
   dist_darwin:
     macos:
-      xcode: 15.3.0
+      xcode: 16.4.0
     shell: /bin/bash --login -eo pipefail
     steps:
       - restore_cache: