Update Block Data API lowestVersion to 1.4 in config.json

[alecgeatches]

The previous changes in #97 failed updating:

Updating vip-block-data-api
{
  repo: 'https://github.com/Automattic/vip-block-data-api',
  folderPrefix: 'vip-integrations/vip-block-data-api-',
  versionPrefix: 'v',
  lowestVersion: '1.3',
  skip: [],
  ignore: [],
  current: { '1.3': '1.3.0', '1.4': '1.4.5' }
}
Checking 1.3
Not found

This was due to checking 1.3 for a new version with the v prefix, which wasn't added until the latest v1.4.6 release. After the 1.3 version check failed, 1.4 was skipped. This PR should hopefully fix that step and allow updates to the newly v-prefixed tag.