chore: replace docker-compose to docker compose

On the CI image, ubuntu-latest uses the latest version of Docker,
which no longer supports the old-style docker-compose command.

README.md

@@ -54,5 +54,5 @@ async fn main() -> Result<(), async_ssh2_tokio::Error> {
 ```
 
 ## Running Tests
-1. install docker and docker-compose
+1. install docker and docker compose
 2. run shell script `./tests/run_unit_tests.sh`

tests/run_unit_tests.sh

@@ -7,13 +7,13 @@ cd "${0%/*}" || exit 1
 
 cd ..
 
-docker-compose -f ./tests/docker-compose.yml build --no-cache || exit 1
+docker compose -f ./tests/docker-compose.yml build --no-cache || exit 1
 
-docker-compose -f ./tests/docker-compose.yml up -d || exit 1
+docker compose -f ./tests/docker-compose.yml up -d || exit 1
 
-docker-compose -f ./tests/docker-compose.yml exec -T async-ssh2-tokio cargo test -- --test-threads=2
+docker compose -f ./tests/docker-compose.yml exec -T async-ssh2-tokio cargo test -- --test-threads=2
 RET=$?
 
-docker-compose -f ./tests/docker-compose.yml down
+docker compose -f ./tests/docker-compose.yml down
 
 exit $RET