fix: resolve series colors

[jungeun-cho]

Please check if the PR fulfills these requirements

• It's submitted to right branch according to our branching model
• It's right issue type on title
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes/features)
• Docs have been added/updated (for bug fixes/features)
• It does not introduce a breaking change or has description for the breaking change

Description

• If the number of series exceeds the number of basic colors provided in the chart, the color index starts again from the beginning.

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Thank you for your contribution to TOAST UI product. 🎉 😘 ✨

[lja1018]

리뷰완료
고생하셨습니다!

[jung-han]

내일 아마 색상 주실 것 같아서 오는것 까지 이 브랜치에서 작업한 다음에 머지하면 될 것 같습니다.