build(deps): update dependencies (#254)

* build(deps): bump denops_std from v6.4.0 to v6.4.2

* build(deps): bump unknownutil from v3.17.0 to v3.18.0

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Co-authored-by: denopendabot <denopendabot@github.com>

denops/docker/deps.ts

@@ -1,5 +1,5 @@
 export * from "https://deno.land/x/denops_std@v6.4.0/mod.ts";
-export { isString } from "https://deno.land/x/unknownutil@v3.17.0/mod.ts";
+export { isString } from "https://deno.land/x/unknownutil@v3.18.0/mod.ts";
 export * as autocmd from "https://deno.land/x/denops_std@v6.4.0/autocmd/mod.ts";
 export { Table } from "https://deno.land/x/cliffy@v0.25.7/table/mod.ts";
 export { assertEquals } from "https://deno.land/std@0.224.0/assert/assert_equals.ts";