fix!: improve interoperability of SNYK_API environment variable

BREAKING CHANGE: The SNYK_API environment variable should be set to the same
value as intended for the Snyk CLI and no longer requires the "/rest" suffix.
Instead, only the base URL of the Snyk API shall be used.

To adapt to the new version, change the SNYK_API environment variable to omit
the "/rest", e.g. `SNYK_API="https://api.snyk.io`".

README.md

@@ -138,7 +138,7 @@ It's important to note vulnerability data is moment-in-time information. By addi
 
 Note the Snyk commands require you to be a Snyk customer, and require passing a valid Snyk API token in the `SNYK_TOKEN` environment variable.
 
-The API base url can be set using the `SNYK_API` environment variable, and if missing it will default to `https://api.snyk.io/rest`.
+The API base url can be set using the `SNYK_API` environment variable, and if missing it will default to `https://api.snyk.io`.
 
 ```
 parlay snyk enrich testing/sbom.cyclonedx.json

lib/snyk/self.go

@@ -88,5 +88,5 @@ func APIBaseURL() string {
 	if snykApiEnv != "" {
 		return snykApiEnv
 	}
-	return "https://api.snyk.io/rest"
+	return "https://api.snyk.io"
 }