Update .env.example

Signed-off-by: irfanshaik11 <[email protected]>

Author: irfanshaik11

karak_offchain/operator/.env.example

@@ -7,7 +7,7 @@ RPC_URL=https://ethereum-holesky-rpc.publicnode.com
 CORS_ORIGIN=*
 COMMON_RATE_LIMIT_WINDOW_MS=1000
 COMMON_RATE_LIMIT_MAX_REQUESTS=10000
-PRIVATE_KEY=6d35c1bdf469031cfe3cbaddd57ca69a36835a39c2a6f2cefc17c804851b0635
+PRIVATE_KEY=
 BLOCK_NUMBER_STORE=/dss/contracts/block-number-store.json
 RUST_LOG=info
 SQUARE_NUMBER_DSS_ADDRESS=0x9A9f2CCfdE556A7E9Ff0848998Aa4a0CFD8863AE