chore(deps): update external dependencies

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@open-wc/testing (source)	3.1.8 -> 3.2.0
lit (source)	2.7.5 -> 2.7.6

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Release Notes

open-wc/open-wc (@​open-wc/testing)

### [`v3.2.0`](https://togithub.com/open-wc/open-wc/blob/HEAD/packages/testing/CHANGELOG.md#320) [Compare Source](https://togithub.com/open-wc/open-wc/compare/@open-wc/testing@3.1.8...57ddb3ccfff6b00468d3a7ebabbc15cfe966f7a9) ##### Minor Changes - [`935c8ff`](https://togithub.com/open-wc/open-wc/commit/935c8ffe): Drop support for Node@14 ##### Patch Changes - [`3289e0e`](https://togithub.com/open-wc/open-wc/commit/3289e0eb): Add oneDefaultPreventedEvent export into testing package and no-side-effect indexes - Updated dependencies \[[`935c8ff`](https://togithub.com/open-wc/open-wc/commit/935c8ffe)] - Updated dependencies \[[`3289e0e`](https://togithub.com/open-wc/open-wc/commit/3289e0eb)] - Updated dependencies \[[`80c6ae6`](https://togithub.com/open-wc/open-wc/commit/80c6ae66)] - chai-a11y-axe@1.5.0 - [@​open-wc/semantic-dom-diff](https://togithub.com/open-wc/semantic-dom-diff)[@​0](https://togithub.com/0).20.0 - [@​open-wc/testing-helpers](https://togithub.com/open-wc/testing-helpers)[@​2](https://togithub.com/2).3.0

lit/lit (lit)

### [`v2.7.6`](https://togithub.com/lit/lit/blob/HEAD/packages/lit/CHANGELOG.md#276) [Compare Source](https://togithub.com/lit/lit/compare/lit@2.7.5...lit@2.7.6) ##### Patch Changes - [#​3968](https://togithub.com/lit/lit/pull/3968) [`5bb40831`](https://togithub.com/lit/lit/commit/5bb408315f89b8855329074ad5d707880dc77923) - Allow undefined to be passed to the ref() directive - [#​3969](https://togithub.com/lit/lit/pull/3969) [`7d8d4a15`](https://togithub.com/lit/lit/commit/7d8d4a1517a10f51b7de442acd9354f6083e1518) - Make RefOrCallback generic like Ref - [#​3987](https://togithub.com/lit/lit/pull/3987) [`bb2560f1`](https://togithub.com/lit/lit/commit/bb2560f15884c3decbedb5be6bab587150910668) - Change the `h` field of `CompiledTemplate`s to a `TemplateStringsArray` preventing the spoofing of `CompiledTemplate`s by JSON injection attacks. This should not be a breaking change for most users unless you're using CompiledTemplates. This is a necessary security fix, similar to [#​2307](https://togithub.com/lit/lit/pull/2307).

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