Change the method of checking latest releases

**Description**

Currently, we call the GitHub API with GET method to get info about latest release from 
```
https://api.github.com/repos/{repo}/releases/latest
``` 
https://github.com/mszostok/version/blob/c7ccd1301ca34e17c14303a974716c0c49818b93/upgrade/update.go#L46-L76

This results in 403 when we hit the quota. 

The `faas-cli`. Does something similar but uses HEAD method on
```
https://github.com/{repo}/releases/latest
```

As a result, the rate limiting is omitted. 

https://github.com/openfaas/faas-cli/blob/927cc77f1dc2f7b8d980fb14e4d50d8839ae26b4/commands/cloud.go#L194

This has only one downside. We don't get the `PublishedAt` field, because of that I had to remove it from the 1.1.0 version.

**Reasons**

Avoid rate limiting.

	func getLatestReleaseInfo(ctx context.Context, repo string) (*ReleaseInfoResponse, error) {
	url := fmt.Sprintf("https://api.github.com/repos/%s/releases/latest", repo)
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, http.NoBody)
	if err != nil {
	return nil, err
	}
	req.Header.Add("Accept", "application/vnd.github+json")

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
	return nil, err
	}
	defer resp.Body.Close()

	rawBody, err := io.ReadAll(resp.Body)
	if err != nil {
	return nil, err
	}

	if resp.StatusCode != http.StatusOK {
	return nil, fmt.Errorf("got unexpected status code %v", resp.Status)
	}

	var latestRelease ReleaseInfoResponse
	err = json.Unmarshal(rawBody, &latestRelease)
	if err != nil {
	return nil, err
	}

	return &latestRelease, nil
	}

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Change the method of checking latest releases #32

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Change the method of checking latest releases #32

Description

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