Pin @babel/* dependencies to 7.29.7

[julien-deramond]

Dependabot tried to bump @babel/* dependencies to the new v8 major at #42559, but it results the following error:

npm error code ERESOLVE
npm error ERESOLVE could not resolve
npm error
npm error While resolving: @rollup/plugin-babel@7.1.0
npm error Found: @babel/core@8.0.1
npm error node_modules/@babel/core
npm error   dev @babel/core@"^8.0.1" from the root project
npm error   peer @babel/core@"^8.0.0" from @babel/cli@8.0.1
npm error   node_modules/@babel/cli
npm error     dev @babel/cli@"^8.0.1" from the root project
npm error   67 more (@babel/helper-create-class-features-plugin, ...)
npm error
npm error Could not resolve dependency:
npm error peer @babel/core@"^7.0.0" from @rollup/plugin-babel@7.1.0
npm error node_modules/@rollup/plugin-babel
npm error   dev @rollup/plugin-babel@"^7.1.0" from the root project
npm error
npm error Conflicting peer dependency: @babel/core@7.29.7
npm error node_modules/@babel/core
npm error   peer @babel/core@"^7.0.0" from @rollup/plugin-babel@7.1.0
npm error   node_modules/@rollup/plugin-babel
npm error     dev @rollup/plugin-babel@"^7.1.0" from the root project
npm error
npm error Fix the upstream dependency conflict, or retry this command with --force or --legacy-peer-deps to accept an incorrect (and potentially broken) dependency resolution.
npm error
npm error
npm error For a full report see:
npm error /home/runner/.npm/_logs/2026-06-25T19_00_50_504Z-eresolve-report.txt
npm error A complete log of this run can be found in: /home/runner/.npm/_logs/2026-06-25T19_00_50_504Z-debug-0.log

The upstream thread at rollup/plugins#2010 talks about @rollup/plugin-babel being compatible or not with Babel v8. Let's wait for upstream information and pin the @babel/* deps to the latest 7 version, 7.29.7.