chore(deps): update dependency babel-plugin-istanbul to v7

This MR contains the following updates:

Package	Type	Update	Change
babel-plugin-istanbul	devDependencies	major	^6.0.0 -> ^7.0.0

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Release Notes

istanbuljs/babel-plugin-istanbul (babel-plugin-istanbul)

v7.0.0

Compare Source

⚠ BREAKING CHANGES

• Drop support for Node versions 8 and 10

Bug Fixes

• container is falsy error with block scoping transform (#​291) (8e76919)
• update istanbul-lib-instrument to v6 (#​292) (643e080)

6.1.1 (2021-10-16)

Bug Fixes

• build: first automated publication (9a1b893)

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