fix: drop CIRCLECI regex from providerNamePatterns

CIRCLE_TOKEN is the only real CircleCI credential var and is already
covered by the exact-match in HighRiskEnvKeys. The CIRCLECI regex
pattern added no meaningful coverage.

Author: Pringled

internal/scan/apikeys.go

@@ -231,7 +231,6 @@ var providerNamePatterns = []*regexp.Regexp{
 	regexp.MustCompile(`(?i)GITHUB`),
 	regexp.MustCompile(`(?i)GITLAB`),
 	regexp.MustCompile(`(?i)BITBUCKET`),
-	regexp.MustCompile(`(?i)CIRCLECI`), // CircleCI — CI supply chain
 	// Productivity / project tools
 	regexp.MustCompile(`(?i)(^|_)LINEAR_`), // (^|_) anchor avoids mid-word false positives
 	regexp.MustCompile(`(?i)NOTION`),