Fix test imports for Deno 2.6.1 compatibility

main.test.ts

@@ -1,5 +1,5 @@
 import { describe, it } from "testing/bdd";
-import { assertEquals } from "assert";
+import { assertEquals } from "@std/assert";
 
 describe("main", () => {
   it("MAIN00 - filters empty arguments", () => {

src/commands/options.test.ts

@@ -1,5 +1,5 @@
 import { describe, it } from "testing/bdd";
-import { assertEquals } from "assert";
+import { assertEquals } from "@std/assert";
 import { build, config, json, output, prerelease } from "./options.ts";
 
 describe("options", () => {

src/commands/set.test.ts

@@ -6,7 +6,7 @@ import {
   returnsNext,
   stub,
 } from "testing/mock";
-import { assertRejects } from "assert";
+import { assertRejects } from "@std/assert";
 import type { Arguments } from "yargs";
 import { set } from "./set.ts";
 import { testContext } from "../util/testContext.ts";

src/hooks/post.test.ts

@@ -1,5 +1,5 @@
 import { parse } from "semver";
-import { assertEquals } from "assert";
+import { assertEquals } from "@std/assert";
 import { resolvesNext, stub } from "testing/mock";
 import * as YAML from "yaml";
 import { IContext } from "../context.ts";

src/util/increment.test.ts

@@ -1,4 +1,4 @@
-import { assertEquals } from "assert";
+import { assertEquals } from "@std/assert";
 import { format, parse } from "semver";
 import { increment, IncrementKind, IncrementOptions } from "./increment.ts";
 

src/util/version.test.ts

@@ -1,5 +1,5 @@
 import { format, parse } from "semver";
-import { assertEquals, AssertionError, assertRejects } from "assert";
+import { assertEquals, AssertionError, assertRejects } from "@std/assert";
 import { assertSpyCall, resolvesNext, stub } from "testing/mock";
 import { IContext } from "../context.ts";
 import { printVersion, readVersionFile, writeVersionFile } from "./version.ts";
@@ -40,7 +40,7 @@ Deno.test({
 Deno.test({
   name: "VER02",
   fn: async () => {
-    const err = new AssertionError("testing");
+    const err = new AssertionError({ message: "testing" });
     // deno-lint-ignore no-explicit-any
     (err as any).code = "TEST";
     const readTextFile = stub(