fix(ci): add MIPSInstructions as exception (ethereum-optimism#12361)

Adds MIPSInstructions as an exception to malformed require.

.semgrep/sol-rules.yaml

@@ -67,6 +67,7 @@ rules:
         - packages/contracts-bedrock/src/cannon/MIPS.sol
         - packages/contracts-bedrock/src/cannon/MIPS2.sol
         - packages/contracts-bedrock/src/cannon/libraries/MIPSMemory.sol
+        - packages/contracts-bedrock/src/cannon/libraries/MIPSInstructions.sol
 
   - id: sol-style-malformed-revert
     languages: [solidity]