Use Go 1.18 to build and test containerd

Go 1.18 is released. Go 1.16 is no longer supported by the Go team.
golangci-lint is updated since 1.44.2 doesn't support Go 1.18.

Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
 
     strategy:
       matrix:
-        go-version: [1.17.8]
+        go-version: [1.18.0]
         os: [ubuntu-18.04, macos-10.15, windows-2019]
 
     steps:
@@ -31,7 +31,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: golangci/golangci-lint-action@v3
         with:
-          version: v1.44.2
+          version: v1.45.0
           skip-cache: true
           args: --timeout=5m
 
@@ -46,7 +46,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.17.8'
+          go-version: '1.18.0'
 
       - uses: actions/checkout@v2
         with:
@@ -78,7 +78,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.17.8'
+          go-version: '1.18.0'
 
       - uses: actions/checkout@v2
         with:
@@ -110,7 +110,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.17.8'
+          go-version: '1.18.0'
       - uses: actions/checkout@v2
       - run: go install github.com/cpuguy83/go-md2man/v2@v2.0.1
       - run: make man
@@ -144,7 +144,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.17.8'
+          go-version: '1.18.0'
       - uses: actions/checkout@v2
       - run: |
           set -e -x
@@ -201,8 +201,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-18.04, macos-10.15, windows-2019, windows-2022]
-        go-version: ['1.16.15', '1.17.8']
-
+        go-version: ['1.17.8', '1.18.0']
     steps:
       - uses: actions/setup-go@v2
         with:
@@ -248,7 +247,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.17.8'
+          go-version: '1.18.0'
 
       - uses: actions/checkout@v2
         with:
@@ -370,7 +369,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.17.8'
+          go-version: '1.18.0'
 
       - uses: actions/checkout@v2
 
@@ -489,7 +488,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.17.8'
+          go-version: '1.18.0'
       - uses: actions/checkout@v2
       - run: sudo -E PATH=$PATH script/setup/install-gotestsum
       - name: Tests