chore(deps-dev): bump spectron from 12.0.0 to 15.0.0

[dependabot-preview[bot]]

Bumps spectron from 12.0.0 to 15.0.0.

Release notes

Sourced from spectron's releases.

v15.0.0

v13.0.0

No release notes provided.

Commits

• a5d13c9 Merge pull request #959 from electron-userland/13-x-y
• a604c48 chore: v15.0.0
• 798cf14 Merge pull request #895 from electron-userland/update-README-14
• f438e53 docs: update README for 14.0.0
• f3c1bfb Merge pull request #884 from electron-userland/v14.0.0
• d2ecadc fix: disable contextIsolation on webframes
• 04f97b5 chore: disable windowByIndex commands
• f60fdbc chore: set fixtures to contentIsolation: false, update deprecation log number
• 86bffe8 chore: upgrade to Electron 12, import @​electron/remote
• f4d097a Merge pull request #783 from AviVahl/replace-request-with-got
• Additional commits viewable in compare view

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