fix(l2): set pendingPrivilegedTxIndex in initializer (#5161)

**Motivation**

<!-- Why does this pull request exist? What are its goals? -->
OZ's upgrade tools require the variables to be set in initializers and
not in constructor/variable declaration. This should not be such a
problem as it will always be initialized as 0, but with this change we
avoid the tool error

**Description**

<!-- A clear and concise general description of the changes this PR
introduces -->

<!-- Link to issues: Resolves #111, Resolves #222 -->

Author: ManuelBilbao

crates/l2/contracts/src/l1/CommonBridge.sol

@@ -93,7 +93,7 @@ contract CommonBridge is
     address public NATIVE_TOKEN_L1;
 
     /// @dev Index pointing to the first unprocessed privileged transaction in the queue.
-    uint256 private pendingPrivilegedTxIndex = 0;
+    uint256 private pendingPrivilegedTxIndex;
 
     modifier onlyOnChainProposer() {
         require(
@@ -124,6 +124,7 @@ contract CommonBridge is
 
         lastFetchedL1Block = block.number;
         transactionId = 0;
+        pendingPrivilegedTxIndex = 0;
 
         PRIVILEGED_TX_MAX_WAIT_BEFORE_INCLUSION = inclusionMaxWait;
 

crates/l2/sdk/src/sdk.rs

@@ -37,10 +37,10 @@ pub use ethrex_sdk_contract_utils::*;
 
 use calldata::from_hex_string_to_h256_array;
 
-// 0x79d6af40f7c9145b0741639ea969c13d5faa3cc6
+// 0xcecd5910a4404ccf2718feb58dac13e975a862a2
 pub const DEFAULT_BRIDGE_ADDRESS: Address = H160([
-    0x79, 0xd6, 0xaf, 0x40, 0xf7, 0xc9, 0x14, 0x5b, 0x07, 0x41, 0x63, 0x9e, 0xa9, 0x69, 0xc1, 0x3d,
-    0x5f, 0xaa, 0x3c, 0xc6,
+    0xce, 0xcd, 0x59, 0x10, 0xa4, 0x40, 0x4c, 0xcf, 0x27, 0x18, 0xfe, 0xb5, 0x8d, 0xac, 0x13, 0xe9,
+    0x75, 0xa8, 0x62, 0xa2,
 ]);
 
 // 0x000000000000000000000000000000000000ffff