Bump aws-actions/configure-aws-credentials from 2 to 6 #4082

Job	Run time
macOS 14 arm <AppleClang arch=arm64, config=Release, shared=ON, simd=ON, cxx=20, python=3.13, docs=ON, oiio=ON>	5m 46s
macOS 14 arm <AppleClang arch=x86_64;arm64, config=Release, shared=ON, simd=ON, cxx=17, python=3.12, docs=OFF, oiio=OFF>	10m 29s
macOS 15 intel <AppleClang arch=${{ matrix.arch-type }}, config=${{ matrix.build-type }}, shared=${{ matrix.build-shared }}, simd=${{ matrix.use-simd }}, cxx=${{ matrix.cxx-standard }}, python=${{ matrix.python-version }}, docs=${{ matrix.build-docs }}, oiio=${{ matrix.use-oiio }}>	-1s
Linux VFX CY${{ matrix.vfx-cy }} <${{ matrix.compiler-desc }} config=${{ matrix.build-type }}, shared=${{ matrix.build-shared }}, simd=${{ matrix.use-simd }}, cxx=${{ matrix.cxx-standard }}, docs=${{ matrix.build-docs }}, oiio=${{ matrix.use-oiio }}>	-1s
Windows 2022 <MSVC config=${{ matrix.build-type }}, shared=${{ matrix.build-shared }}, simd=${{ matrix.use-simd }}, cxx=${{ matrix.cxx-standard }}, python=${{ matrix.python-version }}, docs=${{ matrix.build-docs }}, oiio=${{ matrix.use-oiio }}>	-1s
	16m 12s

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