Update solana-offchain-report-verification.mdx (#2224)

Set version to "1.18.26"

Author: akuzni2

src/content/data-streams/tutorials/streams-direct/solana-offchain-report-verification.mdx

@@ -131,9 +131,9 @@ default = []
 data-streams-report = { git = "https://github.com/smartcontractkit/data-streams-sdk.git" }
 sdk-off-chain = { git = "https://github.com/smartcontractkit/smart-contract-examples.git", branch = "data-streams-solana-integration", package = "sdk-off-chain"}
 
-solana-program = "2.1.6"
-solana-sdk = "2.1.6"
-solana-client = "2.1.6"
+solana-program = "1.18.26"
+solana-sdk = "1.18.26"
+solana-client = "1.18.26"
 hex = "0.4.3"
 borsh = "0.10.3"
 ```