fix(deps): update dependency eslint-config-airbnb-base to v15 (#108)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [eslint-config-airbnb-base](https://togithub.com/airbnb/javascript) | [`^13.0.0` -> `^15.0.0`](https://renovatebot.com/diffs/npm/eslint-config-airbnb-base/13.2.0/15.0.0) | [![age](https://badges.renovateapi.com/packages/npm/eslint-config-airbnb-base/15.0.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/npm/eslint-config-airbnb-base/15.0.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/npm/eslint-config-airbnb-base/15.0.0/compatibility-slim/13.2.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/npm/eslint-config-airbnb-base/15.0.0/confidence-slim/13.2.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>airbnb/javascript</summary>

### [`v15.0.0`](https://togithub.com/airbnb/javascript/compare/eslint-config-airbnb-base-v14.2.1...eslint-config-airbnb-base-v15.0.0)

[Compare Source](https://togithub.com/airbnb/javascript/compare/eslint-config-airbnb-base-v14.2.1...eslint-config-airbnb-base-v15.0.0)

### [`v14.2.1`](https://togithub.com/airbnb/javascript/compare/eslint-config-airbnb-base-v14.2.0...eslint-config-airbnb-base-v14.2.1)

[Compare Source](https://togithub.com/airbnb/javascript/compare/eslint-config-airbnb-base-v14.2.0...eslint-config-airbnb-base-v14.2.1)

### [`v14.2.0`](https://togithub.com/airbnb/javascript/compare/eslint-config-airbnb-base-v14.1.0...eslint-config-airbnb-base-v14.2.0)

[Compare Source](https://togithub.com/airbnb/javascript/compare/eslint-config-airbnb-base-v14.1.0...eslint-config-airbnb-base-v14.2.0)

### [`v14.1.0`](https://togithub.com/airbnb/javascript/compare/eslint-config-airbnb-base-v14.0.0...eslint-config-airbnb-base-v14.1.0)

[Compare Source](https://togithub.com/airbnb/javascript/compare/eslint-config-airbnb-base-v14.0.0...eslint-config-airbnb-base-v14.1.0)

### [`v14.0.0`](https://togithub.com/airbnb/javascript/compare/eslint-config-airbnb-base-v13.2.0...eslint-config-airbnb-base-v14.0.0)

[Compare Source](https://togithub.com/airbnb/javascript/compare/eslint-config-airbnb-base-v13.2.0...eslint-config-airbnb-base-v14.0.0)

</details>

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packages/eslint-config-ibmdotcom/package.json

@@ -19,7 +19,7 @@
   "dependencies": {
     "babel-eslint": "^10.0.3",
     "eslint-config-airbnb": "^19.0.0",
-    "eslint-config-airbnb-base": "^13.0.0",
+    "eslint-config-airbnb-base": "^15.0.0",
     "eslint-config-prettier": "^8.0.0",
     "eslint-plugin-import": "^2.17.3",
     "eslint-plugin-jsdoc": "^15.3.7",