Reverts "[ci] Check macOS 15 for Xcode analyzer warnings (flutter#9427)" (flutter#9509)

Reverts: flutter/packages#9427
Initiated by: ash2moon
Reason for reverting: Looks like this is causing MacOS analyze tasks to fail:
https://ci.chromium.org/ui/p/flutter/builders/prod/Mac_arm64%20macos_platform_tests%20stable%20-%20packages/3087/overview
https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8710976140284515969/+/u/Run_package_tests/xcode_analyze_deprecation/stdout?format=raw
Original PR Author: jmagman

Reviewed By: {vashworth}

This change reverts the following previous change:
Xcode 16 is available in CI as of flutter/packages#8968. Check all packages for macOS 15 deprecations.

The last bump flutter/packages#7544

Related flutter/plugins#5778 and flutter#102835

## Pre-Review Checklist

[^1]: Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling.

Author: auto-submit[bot]

.ci/targets/macos_platform_tests.yaml

@@ -15,7 +15,7 @@ tasks:
   - name: xcode analyze deprecation
     # Ensure we don't accidentally introduce deprecated code.
     script: .ci/scripts/tool_runner.sh
-    args: ["xcode-analyze", "--macos", "--macos-min-version=15.0", "--exclude=script/configs/exclude_xcode_deprecation.yaml,script/configs/xcode_warnings_exceptions.yaml"]
+    args: ["xcode-analyze", "--macos", "--macos-min-version=14.0", "--exclude=script/configs/exclude_xcode_deprecation.yaml,script/configs/xcode_warnings_exceptions.yaml"]
   - name: native test
     script: .ci/scripts/tool_runner.sh
     args: ["native-test", "--macos", "--xcode-warnings-exceptions=script/configs/xcode_warnings_exceptions.yaml"]