renovate qol improvements (#1285)

This adds `go mod tidy` to renovate and permits update grouping to
reduce the noise/pain of renovate updates.

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [x] Other (security config, docs update, etc)

## Checklist before merging

- [x] Test, docs, adr added or updated as needed
- [x] [Contributor Guide
Steps](https://github.com/defenseunicorns/zarf/blob/main/CONTRIBUTING.md#developer-workflow)
followed

renovate.json

@@ -1,6 +1,7 @@
 {
   "extends": [
-    "config:base"
+    "config:base",
+    "group:allNonMajor"
   ],
   "packageRules": [
     {
@@ -13,16 +14,23 @@
       "automergeType": "pr"
     },
     {
-      "matchDepTypes": ["devDependencies"],
+      "matchDepTypes": [
+        "devDependencies"
+      ],
       "automerge": true,
       "automergeType": "pr"
     }
   ],
   "platformAutomerge": true,
   "platformCommit": true,
+  "postUpdateOptions": [
+    "gomodTidy"
+  ],
   "regexManagers": [
     {
-      "fileMatch": ["(^|/)zarf.yaml$"],
+      "fileMatch": [
+        "(^|/)zarf.yaml$"
+      ],
       "matchStringsStrategy": "recursive",
       "matchStrings": [
         "charts:(.|\n)*?(^\\s{4}[\\w:]+|\n$|^\\s{2}-)",