Pin the memchr test-only transitive dependency of regex

Author: TheBlueMatt

ci/ci-tests.sh

@@ -32,6 +32,9 @@ PIN_RELEASE_DEPS # pin the release dependencies in our main workspace
 # The proc-macro2 crate switched to Rust edition 2021 starting with v1.0.66, i.e., has MSRV of 1.56
 [ "$RUSTC_MINOR_VERSION" -lt 56 ] && cargo update -p proc-macro2 --precise "1.0.65" --verbose
 
+# The memchr crate switched to an MSRV of 1.60 starting with v2.6.0
+[ "$RUSTC_MINOR_VERSION" -lt 60 ] && cargo update -p memchr --precise "2.5.0" --verbose
+
 [ "$LDK_COVERAGE_BUILD" != "" ] && export RUSTFLAGS="-C link-dead-code"
 
 export RUST_BACKTRACE=1