fix: use Object.prototype.hasOwnProperty.call for null-prototype store objects

[tsushanth]

Null-prototype objects (created with Object.create(null)) are commonly used as dictionary-style maps because they avoid inherited properties like constructor and __proto__. When a store proxy wraps such an object and a function-valued property is accessed, the proxy calls .hasOwnProperty() directly on the target. Because null-prototype objects do not inherit from Object.prototype, this throws TypeError: target.hasOwnProperty is not a function.

This patch replaces the two direct .hasOwnProperty() calls in store.ts and mutable.ts with Object.prototype.hasOwnProperty.call(target, property), which is safe regardless of the object's prototype chain.

Fixes #2771

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Latest commit: eb200e8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
solid-js	Patch
test-integration	Patch

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