Update macos-13 runner to macos-15-intel runner

[e-perl-NOAA]

macos-13 will no longer be kept up by github actions, so switch to macos-15-intel which has the x86_64 (Intel) architecture

Concisely describe what has been changed/addressed in the pull request.

• Resolves #

What tests have been done?

Where are the relevant files?

• No test files are required for this pull request. -->

What tests/review still need to be done?

None.

Is there an input change for users to Stock Synthesis?

• No, there was no input change. -->

Additional information (optional).

[Copilot]

Pull Request Overview

Updates GitHub Actions workflows to replace the deprecated macos-13 runner with macos-latest-large to maintain x86_64 (Intel) architecture support for macOS builds.

• Replaced macos-13 with macos-latest-large in workflow matrices
• Updated all conditional statements and artifact names to reference the new runner
• Updated workflow step names and comments to reflect the change

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
.github/workflows/test-simple-with-ss3-artifacts.yml	Updated matrix and artifact configurations for the new runner
.github/workflows/build-ss3.yml	Updated build matrix, conditionals, and step names for SS3 compilation
.github/workflows/build-admb-and-ss3-from-source.yml	Updated build matrix and conditionals for ADMB and SS3 source builds

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