Block Library: Social Link: Escape generated class name

[aduth]

This pull request seeks to update the Social Link block to correctly escape the output of the service in the generated class name.

Note that this is not a security issue. Block comment attribute values are sanitized based on user capabilities at save time. Rather, this change is intended to preserve HTML integrity, since otherwise a user could potentially "break out" of the class attribute and mangle the generated markup.

Testing Instructions:

Verify there are no regressions in the class name assigned to a Social Icon block.

1. Navigate to Posts > Add New
2. Insert a Social Icons block
3. Preview the post on the front of the site
4. Verify that the assigned class of the WordPress icon element contains wp-social-link-wordpress.

[github-actions]

Size Change: 0 B

Total Size: 866 kB

ℹ️ View Unchanged

Filename	Size	Change
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build/annotations/index.js	3.43 kB	0 B
build/api-fetch/index.js	3.39 kB	0 B
build/autop/index.js	2.58 kB	0 B
build/blob/index.js	620 B	0 B
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build/block-directory/style-rtl.css	760 B	0 B
build/block-directory/style.css	760 B	0 B
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build/block-library/theme-rtl.css	669 B	0 B
build/block-library/theme.css	671 B	0 B
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build/components/style-rtl.css	15.5 kB	0 B
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build/compose/index.js	5.76 kB	0 B
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build/date/index.js	5.37 kB	0 B
build/deprecated/index.js	772 B	0 B
build/dom-ready/index.js	568 B	0 B
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build/edit-post/index.js	90.9 kB	0 B
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build/edit-post/style.css	8.58 kB	0 B
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build/escape-html/index.js	733 B	0 B
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build/format-library/style-rtl.css	502 B	0 B
build/format-library/style.css	502 B	0 B
build/hooks/index.js	1.92 kB	0 B
build/html-entities/index.js	622 B	0 B
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build/is-shallow-equal/index.js	710 B	0 B
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build/keycodes/index.js	1.68 kB	0 B
build/list-reusable-blocks/index.js	2.99 kB	0 B
build/list-reusable-blocks/style-rtl.css	226 B	0 B
build/list-reusable-blocks/style.css	226 B	0 B
build/media-utils/index.js	4.85 kB	0 B
build/notices/index.js	1.57 kB	0 B
build/nux/index.js	3.02 kB	0 B
build/nux/style-rtl.css	616 B	0 B
build/nux/style.css	613 B	0 B
build/plugins/index.js	2.54 kB	0 B
build/primitives/index.js	1.49 kB	0 B
build/priority-queue/index.js	879 B	0 B
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build/rich-text/index.js	14.3 kB	0 B
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build/viewport/index.js	1.61 kB	0 B
build/warning/index.js	1.14 kB	0 B
build/wordcount/index.js	1.18 kB	0 B

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