Update dependency lit-html to v2.8.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
lit-html (source)	2.7.2 -> 2.8.0

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Release Notes

lit/lit (lit-html)

v2.8.0

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Minor Changes

• #​3993 e2c50569 - Fix return type of isTemplateResult helper to include the CompiledTemplateResult and fix the cache directive to work correctly with CompiledTemplateResults. Also add an explicit isCompiledTemplateResult helper.

v2.7.5

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Patch Changes

• #​3968 5bb40831 - Allow undefined to be passed to the ref() directive

• #​3969 7d8d4a15 - Make RefOrCallback generic like Ref

• #​3987 bb2560f1 - Change the h field of CompiledTemplates to a TemplateStringsArray preventing the spoofing of CompiledTemplates 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.

v2.7.4

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Patch Changes

• #​3888 0f30e6fb - Fix a memory leak cause by lit-html's shared TreeWalker holding a reference to the last tree it walked.

v2.7.3

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Patch Changes

• #​3825 343187b1 - static-html no longer adds an item to TemplateResult's value array for the last consumed static value. This fixes an error with server-side rendering of static html.

• #​3766 4431cbb8 - Fix styleMap initial render of mixed-case custom props

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