[lwan] Update to Ubuntu22.04, fix EOL v21.10 (#7502)

frameworks/C/lwan/lwan-lua.dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:21.10
+FROM ubuntu:22.04
 
 RUN apt-get update -yqq && \
 	apt-get install -yqq \

frameworks/C/lwan/lwan.dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:21.10
+FROM ubuntu:22.04
 
 RUN apt-get update -yqq && \
 	apt-get install -yqq \