Add sbis04 as maintainer

[sbis04]

Please confirm this pull request meets the following requirements:

• [x] I followed the contributing guidelines: https://github.com/github/india/blob/main/CONTRIBUTING.md.

Which change are you proposing?

• [ ] Adding/updating open source project/s
• [x] Adding/updating maintainer/s

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Adding/updating maintainer/s

• [x] Maintainer's location on their GitHub profile indicates as India
• [x] Maintainer has approved this PR to be included on the website

What open source project/s does the individual maintain?

• https://github.com/sbis04/video_trimmer
• https://github.com/sbis04/flutterfire-samples
• https://github.com/sbis04/flutter_maps
• https://github.com/sbis04/explore
• https://github.com/sbis04/flutter_bluetooth
• https://github.com/sbis04/flutter-parallax-cards
• https://github.com/sbis04/responsive_design