Update gftl-shared, require CMake 3.24

Changed

• Update submodule (gFTL-shared v1.11.0)
• Update CMake minimum version to 3.24
• Remove macos-13 from CI, add macos-15
• Add gfortran-15 to macOS CI

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What's Changed

• Merge pull request #157 from Goddard-Fortran-Ecosystem/develop by @tclune in #158
• CI: Drop macos-13, add macos-15, add gfortran-15 by @mathomp4 in #160
• Update CMake minimum version to 3.24 by @mathomp4 in #159
• Update gftl-shared; prepare for v1.10.0 release by @mathomp4 in #161
• GitFlow: Merge develop into main for release by @mathomp4 in #162

Full Changelog: v1.9.0...v1.10.0