fix: direct bugs to new security contact email address.

Author: MoonBoi9001

packages/horizon/contracts/payments/GraphPayments.sol

@@ -16,7 +16,8 @@ import { GraphDirectory } from "../utilities/GraphDirectory.sol";
  * @notice This contract is part of the Graph Horizon payments protocol. It's designed
  * to pull funds (GRT) from the {PaymentsEscrow} and distribute them according to a
  * set of pre established rules.
- * @custom:security-contact Bug bounty program: https://immunefi.com/bug-bounty/thegraph/information/
+ * @custom:security-contact Please email [email protected] if you find any
+ * bugs. We may have an active bug bounty program.
  */
 contract GraphPayments is Initializable, MulticallUpgradeable, GraphDirectory, IGraphPayments {
     using TokenUtils for IGraphToken;

packages/horizon/contracts/payments/PaymentsEscrow.sol

@@ -17,7 +17,8 @@ import { GraphDirectory } from "../utilities/GraphDirectory.sol";
  * @notice This contract is part of the Graph Horizon payments protocol. It holds the funds (GRT)
  * for payments made through the payments protocol for services provided
  * via a Graph Horizon data service.
- * @custom:security-contact Bug bounty program: https://immunefi.com/bug-bounty/thegraph/information/
+ * @custom:security-contact Please email [email protected] if you find any
+ * bugs. We may have an active bug bounty program.
  */
 contract PaymentsEscrow is Initializable, MulticallUpgradeable, GraphDirectory, IPaymentsEscrow {
     using TokenUtils for IGraphToken;

packages/horizon/contracts/payments/collectors/TAPCollector.sol

@@ -17,7 +17,8 @@ import { ECDSA } from "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
  * @dev Note that the contract expects the RAV aggregate value to be monotonically increasing, each successive RAV for the same
  * (data service-payer-receiver) tuple should have a value greater than the previous one. The contract will keep track of the tokens
  * already collected and calculate the difference to collect.
- * @custom:security-contact Bug bounty program: https://immunefi.com/bug-bounty/thegraph/information/
+ * @custom:security-contact Please email [email protected] if you find any
+ * bugs. We may have an active bug bounty program.
  */
 contract TAPCollector is EIP712, GraphDirectory, ITAPCollector {
     using PPMMath for uint256;

packages/horizon/contracts/staking/HorizonStaking.sol

@@ -24,7 +24,8 @@ import { HorizonStakingBase } from "./HorizonStakingBase.sol";
  * This is due to the contract size limit on Arbitrum (24kB). The extension contract implements functionality to support
  * the legacy staking functions and the transfer tools. Both can be eventually removed without affecting the main
  * staking contract.
- * @custom:security-contact Bug bounty program: https://immunefi.com/bug-bounty/thegraph/information/
+ * @custom:security-contact Please email [email protected] if you find any
+ * bugs. We may have an active bug bounty program.
  */
 contract HorizonStaking is HorizonStakingBase, IHorizonStakingMain {
     using TokenUtils for IGraphToken;

packages/horizon/contracts/staking/HorizonStakingExtension.sol

@@ -24,7 +24,8 @@ import { HorizonStakingBase } from "./HorizonStakingBase.sol";
  * without losing rewards or having service interruptions.
  * @dev TODO: Once the transition period and the transfer tools are deemed not necessary this contract
  * can be removed. It's expected the transition period to last for a full allocation cycle (28 epochs).
- * @custom:security-contact Bug bounty program: https://immunefi.com/bug-bounty/thegraph/information/
+ * @custom:security-contact Please email [email protected] if you find any
+ * bugs. We may have an active bug bounty program.
  */
 contract HorizonStakingExtension is HorizonStakingBase, IL2StakingBase, IHorizonStakingExtension {
     using TokenUtils for IGraphToken;

packages/subgraph-service/contracts/DisputeManager.sol

@@ -40,7 +40,8 @@ import { AttestationManager } from "./utilities/AttestationManager.sol";
  * Arbitration:
  * Disputes can only be accepted, rejected or drawn by the arbitrator role that can be delegated
  * to a EOA or DAO.
- * @custom:security-contact Bug bounty program: https://immunefi.com/bug-bounty/thegraph/information/
+ * @custom:security-contact Please email [email protected] if you find any
+ * bugs. We may have an active bug bounty program.
  */
 contract DisputeManager is
     Initializable,

packages/subgraph-service/contracts/SubgraphService.sol

@@ -23,7 +23,8 @@ import { LegacyAllocation } from "./libraries/LegacyAllocation.sol";
 
 /**
  * @title SubgraphService contract
- * @custom:security-contact Bug bounty program: https://immunefi.com/bug-bounty/thegraph/information/
+ * @custom:security-contact Please email [email protected] if you find any
+ * bugs. We may have an active bug bounty program.
  */
 contract SubgraphService is
     Initializable,