fix(rules): entropy, uppercase in samples (#1593)

`go generate` was slightly flaky,
since the example true positive secrets for these rules
did not include uppercase letters
and/or the min entropy was just barely too high

cmd/generate/config/rules/hashicorp_vault.go

@@ -28,10 +28,10 @@ func VaultServiceToken() *config.Rule {
 	// validate
 	tps := []string{
 		// Old
-		utils.GenerateSampleSecret("vault", "s."+secrets.NewSecret(utils.AlphaNumeric("24"))),
+		utils.GenerateSampleSecret("vault", secrets.NewSecret(`s\.[a-zA-Z0-9]{24}`)),
 		`token: s.ZC9Ecf4M5g9o34Q6RkzGsj0z`,
 		// New
-		utils.GenerateSampleSecret("vault", "hvs."+secrets.NewSecret(utils.AlphaNumericExtendedShort("90"))),
+		utils.GenerateSampleSecret("vault", secrets.NewSecret(`hvs\.[\w\-]{90}`)),
 		`-vaultToken hvs.CAESIP2jTxc9S2K7Z6CtcFWQv7-044m_oSsxnPE1H3nF89l3GiYKHGh2cy5sQmlIZVNyTWJNcDRsYWJpQjlhYjVlb1cQh6PL8wEYAg"`, // longer than 100 chars
 	}
 	fps := []string{

cmd/generate/config/rules/plaid.go

@@ -23,7 +23,7 @@ func PlaidAccessID() *config.Rule {
 
 	// validate
 	tps := []string{
-		utils.GenerateSampleSecret("plaid", secrets.NewSecret(utils.AlphaNumeric("24"))),
+		utils.GenerateSampleSecret("plaid", secrets.NewSecret(`[a-zA-Z0-9]{24}`)),
 	}
 	return utils.Validate(r, tps, nil)
 }

cmd/generate/config/rules/sumologic.go

@@ -25,7 +25,7 @@ func SumoLogicAccessID() *config.Rule {
 		`sumologic_access_id = "sug5XpdpaoxtOH"`,     // gitleaks:allow
 		`export SUMOLOGIC_ACCESSID="suDbJw97o9WVo0"`, // gitleaks:allow
 		`SUMO_ACCESS_ID = "suGyI5imvADdvU"`,          // gitleaks:allow
-		utils.GenerateSampleSecret("sumo", "su"+secrets.NewSecret(utils.AlphaNumeric("12"))),
+		utils.GenerateSampleSecret("sumo", secrets.NewSecret(`su[a-zA-Z0-9]{12}`)),
 	}
 	fps := []string{
 		`- (NSNumber *)sumOfProperty:(NSString *)property;`,