Require constituant libraries to enforce versions

The value of this library is that it saves time adding the base set of
Nerves dependencies to projects. If there's a problem with using certain
versions of libraries then that should be sorted out in the library
because not everyone will use `nerves_pack`. Specifying them here adds
to a step to maintenance.

This also removes dependabot. While I think there's value in testing
new library combinations. Dependabot would make updates that disallowed
old versions on major updates. The old versions still worked and this
could easily have introduced a unnecessary dependency version conflict.

.circleci/config.yml

@@ -51,24 +51,6 @@ jobs:
             - _build
             - deps
 
-  automerge:
-    docker:
-        - image: alpine:3.18.4
-    steps:
-      - run:
-          name: Install GitHub CLI
-          command: apk add --no-cache build-base github-cli
-      - run:
-          name: Attempt PR automerge
-          command: |
-            author=$(gh pr view "${CIRCLE_PULL_REQUEST}" --json author --jq '.author.login' || true)
-
-            if [ "$author" = "app/dependabot" ]; then
-              gh pr merge "${CIRCLE_PULL_REQUEST}" --auto --rebase || echo "Failed trying to set automerge"
-            else
-              echo "Not a dependabot PR, skipping automerge"
-            fi
-
 workflows:
   checks:
     jobs:
@@ -77,10 +59,3 @@ workflows:
           matrix:
             parameters:
               tag: *tags
-
-      - automerge:
-          requires: *tags
-          context: org-global
-          filters:
-            branches:
-              only: /^dependabot.*/

mix.exs

@@ -28,16 +28,16 @@ defmodule NervesPack.MixProject do
 
   defp deps do
     [
-      {:nerves_ssh, "~> 1.0"},
-      {:nerves_runtime, "~> 0.6"},
-      {:nerves_time, "~> 0.3"},
-      {:nerves_motd, "~> 0.1"},
-      {:ring_logger, "~> 0.8"},
-      {:vintage_net, "~> 0.10"},
-      {:vintage_net_direct, "~> 0.10"},
-      {:vintage_net_ethernet, "~> 0.10"},
-      {:vintage_net_wifi, "~> 0.10"},
-      {:mdns_lite, "~> 0.8"},
+      {:nerves_ssh, "> 0.0.0"},
+      {:nerves_runtime, "> 0.0.0"},
+      {:nerves_time, "> 0.0.0"},
+      {:nerves_motd, "> 0.0.0"},
+      {:ring_logger, "> 0.0.0"},
+      {:vintage_net, "> 0.0.0"},
+      {:vintage_net_direct, "> 0.0.0"},
+      {:vintage_net_ethernet, "> 0.0.0"},
+      {:vintage_net_wifi, "> 0.0.0"},
+      {:mdns_lite, "> 0.0.0"},
 
       # Dev dependencies
       {:ex_doc, "~> 0.22", only: :docs, runtime: false}