fix: WASMビルド時のコンパイル警告を解消 - #9

Failed to save: <h2>Our services aren't available right now</h2><p>We're working to restore all services as soon as possible. Please check back soon.</p>0Ah+JaQAAAACrk1fbbmCCTIHF1ZNTmr2lREVOMzAxMDAwMTAxMDIzAEVkZ2U=

No cached files found at path "/home/runner/work/fleximg/fleximg/emsdk-cache" - downloading and caching emsdk.