Bump OS in armv7-unknown-linux-gnu

Author: sayantn

ci/docker/armv7-unknown-linux-gnueabihf/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:22.04
+FROM ubuntu:24.04
 RUN apt-get update && apt-get install -y --no-install-recommends \
   gcc \
   g++ \
@@ -10,8 +10,9 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   qemu-user \
   make \
   file \
-  clang-15 \
+  clang \
   lld
+
 ENV CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_LINKER=arm-linux-gnueabihf-gcc \
     CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_RUNNER="qemu-arm -L /usr/arm-linux-gnueabihf" \
     OBJDUMP=arm-linux-gnueabihf-objdump

ci/run.sh

@@ -8,7 +8,7 @@ set -ex
 # having only one thread increases debuggability to be worth it.
 #export RUST_BACKTRACE=full
 #export RUST_TEST_NOCAPTURE=1
-#export RUST_TEST_THREADS=1
+export RUST_TEST_THREADS=1
 
 export RUSTFLAGS="${RUSTFLAGS} -D warnings -Z merge-functions=disabled "
 export HOST_RUSTFLAGS="${RUSTFLAGS}"