fix/1500:Update Sierra Leone currency code from SLL to SLE (#1501)

## Fixes Or Enhances
```
The currency code SLL refers to the old Sierra Leonean leone. 
As of 2022, the leone was redenominated — the new leone now has the code Sierra Leonean leone (new) (SLE).
Numeric code: 925
```

**Make sure that you've checked the boxes below before you submit PR:**
- [x] Tests exist or have been written that cover this particular
change.

@go-playground/validator-maintainers

Author: princekm096

currency_codes.go

@@ -27,7 +27,7 @@ var iso4217 = map[string]struct{}{
 	"OMR": {}, "PKR": {}, "PAB": {}, "PGK": {}, "PYG": {},
 	"PEN": {}, "PHP": {}, "PLN": {}, "QAR": {}, "RON": {},
 	"RUB": {}, "RWF": {}, "SHP": {}, "WST": {}, "STN": {},
-	"SAR": {}, "RSD": {}, "SCR": {}, "SLL": {}, "SGD": {},
+	"SAR": {}, "RSD": {}, "SCR": {}, "SLE": {}, "SGD": {},
 	"XSU": {}, "SBD": {}, "SOS": {}, "SSP": {}, "LKR": {},
 	"SDG": {}, "SRD": {}, "SEK": {}, "CHE": {}, "CHW": {},
 	"SYP": {}, "TWD": {}, "TJS": {}, "TZS": {}, "THB": {},
@@ -59,7 +59,7 @@ var iso4217_numeric = map[int]struct{}{
 	532: {}, 533: {}, 548: {}, 554: {}, 558: {},
 	566: {}, 578: {}, 586: {}, 590: {}, 598: {},
 	600: {}, 604: {}, 608: {}, 634: {}, 643: {},
-	646: {}, 654: {}, 682: {}, 690: {}, 694: {},
+	646: {}, 654: {}, 682: {}, 690: {}, 925: {},
 	702: {}, 704: {}, 706: {}, 710: {}, 728: {},
 	748: {}, 752: {}, 756: {}, 760: {}, 764: {},
 	776: {}, 780: {}, 784: {}, 788: {}, 800: {},

validator_test.go

@@ -13058,6 +13058,8 @@ func TestIsIso4217Validation(t *testing.T) {
 		{"TRY", true},
 		{"EUR", true},
 		{"USA", false},
+		{"SLE", true},
+		{"SLL", false},
 	}
 
 	validate := New()
@@ -13085,6 +13087,8 @@ func TestIsIso4217NumericValidation(t *testing.T) {
 		{8, true},
 		{12, true},
 		{13, false},
+		{925, true},
+		{694, false},
 	}
 
 	validate := New()