Bump deps/stb from `ae721c5` to `5c20573`

[dependabot[bot]]

Bumps deps/stb from ae721c5 to 5c20573.

Commits

• 5c20573 Merge branch 'master' of https://github.com/nothings/stb
• 40adb99 fix accidental check-in of typo in stb_ds.h
• 0dd01c2 Update issue templates
• 758b636 reorder issues
• 42b75e7 Update config.yml
• 8828c2e Update issue templates
• 2e2bef4 stb_image_resize2: update version number
• 44092a1 Fix typo in fix (yes this does fix the ASAN error)
• 9855da7 Update STBIR__FREE_AND_CLEAR fix as per suggestions
• 0625101 Fix STBIR__FREE_AND_CLEAR causing null reference member access
• Additional commits viewable in compare view

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