Bump elliptic from 6.5.4 to 6.5.7 in /cobalt/demos/content/media-element-demo #2916

Job	Run time
evergreen-arm64 / initialize	0s
evergreen-arm-hardfp / initialize	0s
evergreen-arm-softfp / initialize	0s
evergreen-x64 / initialize	0s
evergreen-arm64 / docker-build-image	0s
evergreen-arm64 / docker-unittest-image	0s
evergreen-arm-hardfp / docker-build-image	0s
evergreen-arm-hardfp / docker-unittest-image	0s
evergreen-arm-softfp / docker-build-image	0s
evergreen-arm-softfp / docker-unittest-image	0s
evergreen-x64 / docker-build-image	0s
evergreen-x64 / docker-unittest-image	0s
evergreen-arm64 / ${{ matrix.name }}_${{ matrix.config }}	0s
evergreen-arm-hardfp / ${{ matrix.name }}_${{ matrix.config }}	0s
evergreen-arm-softfp / ${{ matrix.name }}_${{ matrix.config }}	0s
evergreen-x64 / ${{ matrix.name }}_${{ matrix.config }}	0s
evergreen-arm64 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
evergreen-arm64 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
evergreen-arm-hardfp / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
evergreen-arm-hardfp / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
evergreen-arm-softfp / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
evergreen-arm-softfp / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
evergreen-x64 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
evergreen-x64 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
	0s

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