Fix for SVM polling crashes

[abernatskiy]

Squids indexing Soon Mainnet, an SVM chain, are crashing with

AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:

                                     (0, assert_1.default)(prevSlot == null || prevSlot < block[0])

                                       at PollStream.checkChain (/home/abernatskiy/soon-nft-sale-index/node_modules/@subsquid/solana-rpc/lib/ingest/poll.js:127:38)
                                       at PollStream.trimInvalidTail (/home/abernatskiy/soon-nft-sale-index/node_modules/@subsquid/solana-rpc/lib/ingest/poll.js:110:24)
                                       at PollStream.next (/home/abernatskiy/soon-nft-sale-index/node_modules/@subsquid/solana-rpc/lib/ingest/poll.js:42:18)
                                       at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
                                       at async ColdIngest.serialFetch (/home/abernatskiy/soon-nft-sale-index/node_modules/@subsquid/solana-rpc/lib/ingest/cold.js:116:26)
                                       at async ColdIngest.jobs (/home/abernatskiy/soon-nft-sale-index/node_modules/@subsquid/solana-rpc/lib/ingest/cold.js:98:21)
                                       at async map (/home/abernatskiy/soon-nft-sale-index/node_modules/@subsquid/solana-rpc/node_modules/@subsquid/util-internal/lib/async.js:169:24)
                                       generatedMessage: true
                                       code: ERR_ASSERTION
                                       actual: false
                                       expected: true
                                       operator: ==

This seems to fix it.

[eldargab]

Yes, the fix is correct. Please add a change file and coordinate the release with @belopash .