commentFormatting: put a space between `//` and comment text (gocritic)

File is not `goimports`-ed with -local github.com/upbound/upjet-provider-template (goimports)

issues found

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744, actions/setup-go@6edd4406fa81c3da01a34fa6f6343087c207a568, actions/cache@v3, golangci/golangci-lint-action@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.