test: replace deprecated secp256k1 context flags usage #30687
Merged
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The flags
SECP256K1_CONTEXT_{SIGN,VERIFY}
have been marked as deprecated since libsecp256k1 version 0.2 (released in December 2022), with the recommendation to use SECP256K1_CONTEXT_NONE instead, see bitcoin-core/secp256k1#1126 and https://github.com/bitcoin-core/secp256k1/blob/1988855079fa8161521b86515e77965120fdc734/CHANGELOG.md?plain=1#L132. Note that in contrast to other deprecated functions/variables, these defines don't have a deprecated attribute and hence don't lead to a compiler warning (see bitcoin-core/secp256k1#1126 (comment)), so they are not easily detected.