Update images for 20.04

[cybozu-neco]

Update images for 20.04

• Update ubuntu-dev:20.04 packages

--- ubuntu-dev-20.04.20230809	2023-08-13 22:04:45.689692729 +0000
+++ ubuntu-dev-20.04-new	2023-08-13 22:04:46.133694459 +0000
@@ -160,7 +160,7 @@
 ii  libuuid1:amd64             2.34-0.1ubuntu9.4                 amd64        Universally Unique ID library
 ii  libwind0-heimdal:amd64     7.7.0+dfsg-1ubuntu1.4             amd64        Heimdal Kerberos - stringprep implementation
 ii  libzstd1:amd64             1.4.4+dfsg-3ubuntu0.1             amd64        fast lossless compression algorithm
-ii  linux-libc-dev:amd64       5.4.0-155.172                     amd64        Linux Kernel Headers for development
+ii  linux-libc-dev:amd64       5.4.0-156.173                     amd64        Linux Kernel Headers for development
 ii  locales                    2.31-0ubuntu9.9                   all          GNU C Library: National Language (locale) data [support]
 ii  login                      1:4.8.1-1ubuntu5.20.04.4          amd64        system login tools
 ii  logsave                    1.45.5-2ubuntu1.1                 amd64        save the output of a command in a log file