ci: pin hyper-rustls for Rust 1.75 sync builds

The build-sync job started resolving hyper-rustls v0.27.8 for the esplora-async-https configuration. That release requires rustc 1.85, but the sync CI job still runs on Rust 1.75.0.

Pin hyper-rustls to 0.27.7 when building with rustc older than 1.85, alongside the existing MSRV dependency pins in ci-tests-common.sh.

AI tools were used in preparing this commit.

Author: joostjager

ci/ci-tests-common.sh

@@ -20,4 +20,7 @@ PIN_RELEASE_DEPS # pin the release dependencies in our main workspace
 # Starting with version 1.2.0, the `idna_adapter` crate has an MSRV of rustc 1.81.0.
 [ "$RUSTC_MINOR_VERSION" -lt 81 ] && cargo update -p idna_adapter --precise "1.1.0" --quiet
 
+# Starting with version 0.27.8, the `hyper-rustls` crate has an MSRV of rustc 1.85.0.
+[ "$RUSTC_MINOR_VERSION" -lt 85 ] && cargo update -p hyper-rustls --precise "0.27.7" --quiet
+
 export RUST_BACKTRACE=1