fix: Include CGridItem in type definitions

.changeset/dull-books-judge.md

@@ -0,0 +1,5 @@
+---
+"@chakra-ui/vue": patch
+---
+
+Include CGridItem in type definitions

packages/chakra-ui-core/types/component.d.ts

@@ -58,6 +58,7 @@ export class CFormHelperText extends Vue {}
 export class CFormLabel extends Vue {}
 export class CFragment extends Vue {}
 export class CGrid extends Vue {}
+export class CGridItem extends Vue {}
 export class CHeading extends Vue {}
 export class CIcon extends Vue {}
 export class CIconButton extends Vue {}