package.json: Pin down eslint-plugin-react
package.json: Pin down eslint-plugin-react

Version 7.15.0 causes regression and all builds fail.

Closes #12897
martinpitt/cockpit,deryni/cockpit,deryni/cockpit,deryni/cockpit,cockpituous/cockpit,mvollmer/cockpit,mvollmer/cockpit,deryni/cockpit,moraleslazaro/cockpit,deryni/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,cockpituous/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,martinpitt/cockpit,cockpituous/cockpit,mvollmer/cockpit,garrett/cockpit,martinpitt/cockpit,cockpit-project/cockpit,mvollmer/cockpit,cockpit-project/cockpit,garrett/cockpit,mvollmer/cockpit,cockpituous/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,deryni/cockpit,deryni/cockpit,moraleslazaro/cockpit,garrett/cockpit,garrett/cockpit,cockpituous/cockpit,cockpituous/cockpit,garrett/cockpit,moraleslazaro/cockpit