fix invalid definition in plugins-ci and plugins-ci-redis

[rluvaton]

fix:

• Skip Windows on Node.js v14 #80

Example of usage:

strategy:
  matrix:
    os: [macos-latest, windows-latest]
    version: [12, 14, 16]
    environment: [staging, production]
    exclude:
      - os: macos-latest
        version: 12
        environment: production
      - os: windows-latest
        version: 16
runs-on: ${{ matrix.os }}

from Github Actions docs - Using a matrix for your jobs - Excluding matrix configurations

[rluvaton]

@mcollina

[mcollina]

lgtm