chore(lint): add new linters and update codebase

- add canonicalheader
- add copyloopvar
- add fatcontext
- add intrange

internal/provider/utils/cipher_test.go

@@ -30,7 +30,6 @@ func Test_CipherLines(t *testing.T) {
 		},
 	}
 	for name, testCase := range testCases {
-		testCase := testCase
 		t.Run(name, func(t *testing.T) {
 			t.Parallel()
 

internal/provider/utils/connection_test.go

@@ -185,7 +185,6 @@ func Test_GetConnection(t *testing.T) {
 	}
 
 	for name, testCase := range testCases {
-		testCase := testCase
 		t.Run(name, func(t *testing.T) {
 			t.Parallel()
 			ctrl := gomock.NewController(t)

internal/provider/utils/filtering_test.go

@@ -274,7 +274,6 @@ func Test_FilterServers(t *testing.T) {
 	}
 
 	for name, testCase := range testCases {
-		testCase := testCase
 		t.Run(name, func(t *testing.T) {
 			t.Parallel()
 
@@ -305,7 +304,6 @@ func Test_filterByPossibilities(t *testing.T) {
 	}
 
 	for name, testCase := range testCases {
-		testCase := testCase
 		t.Run(name, func(t *testing.T) {
 			t.Parallel()
 			filtered := filterByPossibilities(testCase.value, testCase.possibilities)

internal/provider/utils/port_test.go

@@ -115,7 +115,6 @@ func Test_GetPort(t *testing.T) {
 	}
 
 	for name, testCase := range testCases {
-		testCase := testCase
 		t.Run(name, func(t *testing.T) {
 			t.Parallel()
 

internal/provider/utils/protocol_test.go

@@ -46,7 +46,6 @@ func Test_getProtocol(t *testing.T) {
 	}
 
 	for name, testCase := range testCases {
-		testCase := testCase
 		t.Run(name, func(t *testing.T) {
 			t.Parallel()
 
@@ -123,7 +122,6 @@ func Test_filterByProtocol(t *testing.T) {
 	}
 
 	for name, testCase := range testCases {
-		testCase := testCase
 		t.Run(name, func(t *testing.T) {
 			t.Parallel()
 

internal/provider/utils/wireguard_test.go

@@ -63,7 +63,6 @@ func Test_BuildWireguardSettings(t *testing.T) {
 	}
 
 	for name, testCase := range testCases {
-		testCase := testCase
 		t.Run(name, func(t *testing.T) {
 			t.Parallel()