Tidy up dependencies

Update Go to 1.20 while we are here.

.github/workflows/test.yaml

@@ -10,7 +10,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@37335c7bb261b353407cff977110895fa0b4f7d8  # v2.1.3
         with:
-          go-version: 1.15.x
+          go-version: 1.20.x
       - name: Checkout code
         uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f  # v2.3.4
       - name: Test

go.mod

@@ -1,13 +1,23 @@
 module github.com/timoreimann/pdsync
 
-go 1.13
+go 1.20
 
 require (
 	github.com/PagerDuty/go-pagerduty v1.1.2
-	github.com/cheekybits/is v0.0.0-20150225183255-68e9c0620927 // indirect
 	github.com/google/go-cmp v0.5.4
 	github.com/matryer/try v0.0.0-20161228173917-9ac251b645a2
 	github.com/slack-go/slack v0.6.3
 	github.com/urfave/cli/v2 v2.1.1
 	gopkg.in/yaml.v2 v2.2.8
 )
+
+require (
+	github.com/cheekybits/is v0.0.0-20150225183255-68e9c0620927 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d // indirect
+	github.com/google/go-querystring v1.0.0 // indirect
+	github.com/gorilla/websocket v1.2.0 // indirect
+	github.com/pkg/errors v0.8.0 // indirect
+	github.com/russross/blackfriday/v2 v2.0.1 // indirect
+	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
+	golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 // indirect
+)

go.sum

@@ -18,7 +18,6 @@ github.com/google/go-querystring v1.0.0 h1:Xkwi/a1rcvNg1PPYe5vI8GbeBY/jrVuDX5ASu
 github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
 github.com/gorilla/websocket v1.2.0 h1:VJtLvh6VQym50czpZzx07z/kw9EgAxI3x1ZB8taTMQQ=
 github.com/gorilla/websocket v1.2.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
-github.com/hashicorp/errwrap v1.0.0 h1:hLrqtEDnRye3+sgx6z4qVLNuviH3MR5aQ0ykNJa/UYA=
 github.com/hashicorp/errwrap v1.0.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
 github.com/hashicorp/go-multierror v1.0.0/go.mod h1:dHtQlpGsu+cZNNAkkCN/P3hoUDHhCYQXV3UM06sGGrk=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
@@ -41,7 +40,6 @@ github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeV
 github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
 github.com/slack-go/slack v0.6.3 h1:qU037g8gQ71EuH6S9zYKnvYrEUj0fLFH4HFekFqBoRU=
 github.com/slack-go/slack v0.6.3/go.mod h1:HE4RwNe7YpOg/F0vqo5PwXH3Hki31TplTvKRW9dGGaw=
-github.com/stretchr/objx v0.1.1 h1:2vfRuCMp5sSVIDSqO8oNnWJq7mPa6KVP3iPIwFBuy8A=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=

vendor/modules.txt

@@ -1,35 +1,50 @@
 # github.com/PagerDuty/go-pagerduty v1.1.2
+## explicit; go 1.12
 github.com/PagerDuty/go-pagerduty
+# github.com/cheekybits/is v0.0.0-20150225183255-68e9c0620927
+## explicit
 # github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d
+## explicit; go 1.12
 github.com/cpuguy83/go-md2man/v2/md2man
 # github.com/google/go-cmp v0.5.4
+## explicit; go 1.8
 github.com/google/go-cmp/cmp
 github.com/google/go-cmp/cmp/cmpopts
 github.com/google/go-cmp/cmp/internal/diff
 github.com/google/go-cmp/cmp/internal/flags
 github.com/google/go-cmp/cmp/internal/function
 github.com/google/go-cmp/cmp/internal/value
 # github.com/google/go-querystring v1.0.0
+## explicit
 github.com/google/go-querystring/query
 # github.com/gorilla/websocket v1.2.0
+## explicit
 github.com/gorilla/websocket
 # github.com/matryer/try v0.0.0-20161228173917-9ac251b645a2
+## explicit
 github.com/matryer/try
 # github.com/pkg/errors v0.8.0
+## explicit
 github.com/pkg/errors
 # github.com/russross/blackfriday/v2 v2.0.1
+## explicit
 github.com/russross/blackfriday/v2
 # github.com/shurcooL/sanitized_anchor_name v1.0.0
+## explicit
 github.com/shurcooL/sanitized_anchor_name
 # github.com/slack-go/slack v0.6.3
+## explicit; go 1.13
 github.com/slack-go/slack
 github.com/slack-go/slack/internal/errorsx
 github.com/slack-go/slack/internal/timex
 github.com/slack-go/slack/slackutilsx
 # github.com/urfave/cli/v2 v2.1.1
+## explicit; go 1.11
 github.com/urfave/cli/v2
 # golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543
+## explicit; go 1.11
 golang.org/x/xerrors
 golang.org/x/xerrors/internal
 # gopkg.in/yaml.v2 v2.2.8
+## explicit
 gopkg.in/yaml.v2