Update evm.mdx (#627)

add monad beta

Author: KemarTiti

pages/price-feeds/contract-addresses/evm.mdx

@@ -140,6 +140,7 @@ Pyth is currently available on the EVM networks below using Pyth Stable price so
 | Meter testnet                     | [`0x5a71C07a0588074443545eE0c08fb0375564c3E4`](https://scan-warringstakes.meter.io/address/0x5a71C07a0588074443545eE0c08fb0375564c3E4)                                       |
 | Mode testnet                      | [`0xA2aa501b19aff244D90cc15a4Cf739D2725B5729`](https://sepolia.explorer.mode.network/address/0xA2aa501b19aff244D90cc15a4Cf739D2725B5729)                                     |
 | Monad testnet                     | [`0x2880aB155794e7179c9eE2e38200202908C17B43`](https://testnet.monadexplorer.com/address/0x2880aB155794e7179c9eE2e38200202908C17B43)                                         |
+| Monad testnet - beta oracle       | [`0xad2B52D2af1a9bD5c561894Cdd84f7505e1CD0B5`](https://testnet.monadexplorer.com/address/0xad2B52D2af1a9bD5c561894Cdd84f7505e1CD0B5)                                         |
 | Morph Holesky testnet             | [`0x2880aB155794e7179c9eE2e38200202908C17B43`](https://explorer-holesky.morphl2.io/address/0x2880aB155794e7179c9eE2e38200202908C17B43)                                       |
 | Morph testnet                     | [`0xA2aa501b19aff244D90cc15a4Cf739D2725B5729`](https://explorer-testnet.morphl2.io/address/0xA2aa501b19aff244D90cc15a4Cf739D2725B5729)                                       |
 | Mumbai (Polygon testnet)          | [`0xFC6bd9F9f0c6481c6Af3A7Eb46b296A5B85ed379`](https://mumbai.polygonscan.com/address/0xFC6bd9F9f0c6481c6Af3A7Eb46b296A5B85ed379)                                            |