update golang to 1.18.2

go1.18.2 (released 2022-05-10) includes security fixes to the syscall package,
as well as bug fixes to the compiler, runtime, the go command, and the crypto/x509,
go/types, net/http/httptest, reflect, and sync/atomic packages. See the Go 1.18.2
milestone on the issue tracker for details:

https://github.com/golang/go/issues?q=milestone%3AGo1.18.2+label%3ACherryPickApproved

Full diff: http://github.com/golang/go/compare/go1.18.1...go1.18.2

Includes fixes for:

- CVE-2022-29526 (http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-29526);
  (description at https://go.dev/issue/52313).

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

.github/workflows/test.yml

@@ -59,7 +59,7 @@ jobs:
         name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.18.1
+          go-version: 1.18.2
       -
         name: Test
         run: |