chore(certora): upgrade certora-cli to 7.0.7

This upgrade certora-cli on CI to version 7.0.7 which no longer requires
the `STORAGE` keyword in storage hooks.

.github/workflows/ci.yml

@@ -136,7 +136,7 @@ jobs:
         with: { java-version: "11", java-package: jre }
 
       - name: Install Certora CLI
-        run: pip3 install certora-cli==6.3.1
+        run: pip3 install certora-cli==7.0.7
 
       - name: Install Solidity
         run: |

certora/specs/StakeManager.spec

@@ -83,15 +83,15 @@ ghost mathint sumOfBalances /* sigma account[u].balance forall u */ {
 	init_state axiom sumOfBalances == 0;
 }
 
-hook Sstore epochs[KEY uint256 epochId].epochReward uint256 newValue (uint256 oldValue) STORAGE {
+hook Sstore epochs[KEY uint256 epochId].epochReward uint256 newValue (uint256 oldValue) {
   sumOfEpochRewards = sumOfEpochRewards - oldValue + newValue;
 }
 
-hook Sstore accounts[KEY address addr].balance uint256 newValue (uint256 oldValue) STORAGE {
+hook Sstore accounts[KEY address addr].balance uint256 newValue (uint256 oldValue) {
     sumOfBalances = sumOfBalances - oldValue + newValue;
 }
 
-hook Sstore accounts[KEY address addr].currentMP uint256 newValue (uint256 oldValue) STORAGE {
+hook Sstore accounts[KEY address addr].currentMP uint256 newValue (uint256 oldValue) {
     sumOfMultipliers = sumOfMultipliers - oldValue + newValue;
 }
 

certora/specs/StakeManagerProcessAccount.spec

@@ -24,7 +24,7 @@ function getAccountLockUntil(address addr) returns uint256 {
   return lockUntil;
 }
 
-hook Sstore accounts[KEY address addr].balance uint256 newValue (uint256 oldValue) STORAGE {
+hook Sstore accounts[KEY address addr].balance uint256 newValue (uint256 oldValue) {
     balanceChangedInEpoch[addr] = accountProcessed[addr];
 }