Pin memchr in our release dependency list due to `core2` using it

We're working with rust-bitcoin to remove the `core2` dependency
at https://github.com/rust-bitcoin/rust-bitcoin/pull/2066 but until
that lands and we can upgrade rust-bitcoin we're stuck with it. In
the mean time, we should still pass our MSRV tests.

diff --git a/ci/ci-tests.sh b/ci/ci-tests.sh
index 74ba5a7da71d268e473eab0a34bcebbd43727db9..7b925cc8544eca2a077ab7a5b3aa9f2af27c3398 100755 (executable)
--- a/ci/ci-tests.sh
+++ b/ci/ci-tests.sh
@@ -123,6 +123,10 @@ if [[ $RUSTC_MINOR_VERSION -gt 67 ]]; then
        # lightning-transaction-sync's MSRV is 1.67
        cargo check --verbose --color always --features lightning-transaction-sync
 else
+       # The memchr crate switched to an MSRV of 1.60 starting with v2.6.0
+       # This is currently only a release dependency via core2, which we intend to work with
+       # rust-bitcoin to remove soon.
+       [ "$RUSTC_MINOR_VERSION" -lt 60 ] && cargo update -p memchr --precise "2.5.0" --verbose
        cargo check --verbose --color always
 fi
 popd