[extrinsics]
set minimum supported rust-version
to 1.70
#1241
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The
subxt-signer
crate utilizesOnceLock
which was only stabilized in1.70
.I have update the MSRV in subxt see paritytech/subxt#1097. But we should do it here too so we can get a release out in the meantime to prevent issues such as #1240.