Bump @blockly/theme-modern from 2.1.9 to 2.1.10
Bump @blockly/theme-modern from 2.1.9 to 2.1.10

Bumps [@blockly/theme-modern](https://github.com/google/blockly-samples/tree/HEAD/plugins/theme-modern) from 2.1.9 to 2.1.10.
- [Release notes](https://github.com/google/blockly-samples/releases)
- [Commits](https://github.com/google/blockly-samples/commits/@blockly/theme-modern@2.1.10/plugins/theme-modern)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
mark-friedman/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,google/blockly,google/blockly,mark-friedman/blockly,google/blockly,mark-friedman/blockly,rachel-fenichel/blockly,google/blockly,google/blockly,rachel-fenichel/blockly,mark-friedman/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,google/blockly,google/blockly,mark-friedman/blockly,mark-friedman/blockly,rachel-fenichel/blockly