chore: migrate to eslint@9

Related to bpmn-io/internal-docs#1042

eslint.config.mjs

@@ -0,0 +1,46 @@
+import bpmnIoPlugin from 'eslint-plugin-bpmn-io';
+
+const buildScripts = [
+  '*.js',
+  '*.mjs',
+  'test/distro/karma.conf.js'
+];
+
+export default [
+  {
+    ignores: [
+      'dist'
+    ]
+  },
+  ...bpmnIoPlugin.configs.browser.map(config => {
+    return {
+      ...config,
+      ignores: buildScripts
+    };
+  }),
+  ...bpmnIoPlugin.configs.node.map(config => {
+    return {
+      ...config,
+      files: buildScripts
+    };
+  }),
+  ...bpmnIoPlugin.configs.mocha.map(config => {
+    return {
+      ...config,
+      files: [
+        'test/**/*.js'
+      ]
+    };
+  }),
+  {
+    files: [
+      'test/**/*.js'
+    ],
+    languageOptions: {
+      globals: {
+        require: false,
+        sinon: false
+      }
+    }
+  }
+];