feat: upgrade to Redis 7

Author: vmihailenco

Makefile

@@ -16,7 +16,7 @@ bench: testdeps
 
 testdata/redis:
 	mkdir -p $@
-	wget -qO- https://download.redis.io/releases/redis-6.2.5.tar.gz | tar xvz --strip-components=1 -C $@
+	wget -qO- https://download.redis.io/releases/redis-7.0.0.tar.gz | tar xvz --strip-components=1 -C $@
 
 testdata/redis/src/redis-server: testdata/redis
 	cd $< && make all

README.md

@@ -69,6 +69,12 @@ And then install go-redis/v8 (note _v8_ in the import; omitting it is a popular
 go get github.com/go-redis/redis/v8
 ```
 
+If you need **Redis 7** support, install go-redis/v9:
+
+```shell
+go get github.com/go-redis/redis/v9
+```
+
 ## Quickstart
 
 ```go