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like in below code we are using textareacontrol 
<PanelRow>
	{postOne && postOne.id && (
		<TextareaControl
			label={__('Custom Article Title', 'blackstone')}
			help="Optional text that will override the title of this selected article."
			value={customTitleOne}
			onChange={(customTitleOne) => {
				setAttributes({ customTitleOne });
			}}
		/>
	)}
</PanelRow>


in below code convert textareacontrol to richtext like below code

<PanelRow>
	{postOne && postOne.id && (
		<TextareaControl
			label={__('Custom Article Title', 'blackstone')}
			help="Optional text that will override the title of this selected article."
			value={customTitleOne}
			onChange={(customTitleOne) => {
				setAttributes({ customTitleOne });
			}}
		/>
	)}
</PanelRow>




we have to use this code like it is using here convert textareacontrol code to richtext also use label/title in richtext like below code so change above code accordingly
<PanelBody title={__('Image Rendition Settings', 'blackstone')}>
	<PanelRow>
		<RichText
			enforce={false}
			className="components-text-control__input bx-vertical-list__input"
			placeholder={__('Rendition Name', 'blackstone')}
			multiline={false}
			onChange={(renditionName) => setAttributes({ renditionName })}
			value={renditionName}
		/>
	</PanelRow>
</PanelBody>