Use a more up-to-date Renovate (#55)

.github/renovate.json

@@ -0,0 +1,54 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended",
+    "helpers:pinGitHubActionDigests",
+    ":pinDevDependencies",
+    ":pinDigestsDisabled"
+  ],
+  "packageRules": [
+    {
+      "matchFileNames": [
+        ".github/**/*.yml",
+        ".tool-versions"
+      ],
+      "groupName": "dev tools"
+    },
+    {
+      "matchFileNames": [
+        "rebar.config"
+      ],
+      "groupName": "rebar.config deps"
+    },
+    {
+      "matchPackagePrefixes": [
+        "minimum_otp_vsn"
+      ],
+      "enabled": false
+    }
+  ],
+  "customManagers": [
+    {
+      "description": "Match versions (per datasource and depName) in .github/**/*.yml",
+      "customType": "regex",
+      "fileMatch": [
+        ".github/.*/.*\\.yml"
+      ],
+      "matchStrings": [
+        "# renovate datasource: (?<datasource>[^,]+), depName: (?<depName>[^\\n]+)\\n.+?(?<currentValue>v?\\d+(\\.\\d+(\\.\\d+)?)?(-[^\\n]+)?)\\n"
+      ]
+    },
+    {
+      "description": "Match versions in rebar.config",
+      "customType": "regex",
+      "fileMatch": [
+        "rebar.config"
+      ],
+      "datasourceTemplate": "hex",
+      "matchStrings": [
+        "{(?<depName>[^,]+), \"(?<currentValue>\\d+\\.\\d+(\\.\\d+)?)\""
+      ],
+      "versioningTemplate": "semver"
+    }
+  ]
+}