Log Message:
Update go118 to 1.18.9 (security release).

This minor release includes 2 security fixes following the security policy
<https://go.dev/security>:

- os, net/http: avoid escapes from os.DirFS and http.Dir on Windows

  The os.DirFS function and http.Dir type provide access to a tree of files
  rooted at a given directory. These functions permitted access to Windows
  device files under that root. For example, \ 
os.DirFS("C:/tmp").Open("COM1")
  would open the COM1 device.  Both os.DirFS and http.Dir only provide
  read-only filesystem access.

  In addition, on Windows, an os.DirFS for the directory \ (the root of the
  current drive) can permit a maliciously crafted path to escape from the drive
  and access any path on the system.

  The behavior of os.DirFS("") has changed. Previously, an empty root was
  treated equivalently to "/", so \ 
os.DirFS("").Open("tmp") would open the path
  "/tmp".  This now returns an error.

  This is CVE-2022-41720 and Go issue https://go.dev/issue/56694.

- net/http: limit canonical header cache by bytes, not entries

  An attacker can cause excessive memory growth in a Go server accepting HTTP/2
  requests.

  HTTP/2 server connections contain a cache of HTTP header keys sent by the
  client. While the total number of entries in this cache is capped, an
  attacker sending very large keys can cause the server to allocate
  approximately 64 MiB per open connection.

  This issue is also fixed in golang.org/x/net/http2, for users manually
  configuring HTTP/2.

  Thanks to Josselin Costanzi for reporting this issue.

  This is CVE-2022-41717 and Go issue https://go.dev/issue/56350.