CI: Fix golangci-lint linter issues, add prealloc linter and bump version depends for Go 1.18 (#915)

* Bump CI versions

* Specifically set go version as 1.17.x bumps it to 1.18

* Another

* Adjust AppVeyor

* Part 1 of linter issues

* Part 2

* Fix various linters and improvements

* Part 3

* Finishing touches

* Tests and EqualFold

* Fix nitterinos plus bonus requester jobs bump for exchanges with large number of tests

* Fix nitterinos and bump golangci-lint timeout for AppVeyor

* Address nits, ensure all books are returned on err due to syncer regression

* Fix the wiggins

* Fix duplication

* Fix nitterinos

.github/dependabot.yml

@@ -1,10 +1,13 @@
 version: 2
 updates:
+- package-ecosystem: "github-actions"
+  directory: "/"
+  schedule:
+    interval: "weekly"
 - package-ecosystem: gomod
   directory: "/"
   schedule:
-    interval: daily
-    time: "19:30"
+    interval: "weekly"
   open-pull-requests-limit: 10
 - package-ecosystem: npm
   directory: "/web"
@@ -12,4 +15,3 @@ updates:
     interval: "weekly"
   # deprecated for now as it requires a more in-depth overhaul
   open-pull-requests-limit: 0
-