dev: pin dev dependencies, and turn on dependabot updates

.github/dependabot.yml

@@ -0,0 +1,11 @@
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+version: 2
+updates:
+  - package-ecosystem: "bundler"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/sqlite3-ruby.yml

@@ -86,7 +86,7 @@ jobs:
     steps:
       - run: |
           dnf group install -y "C Development Tools and Libraries"
-          dnf install -y ruby ruby-devel
+          dnf install -y ruby ruby-devel libyaml-devel
       - uses: actions/checkout@v3
       - run: bundle install
       - run: bundle exec rake compile -- --disable-system-libraries

Gemfile

@@ -2,10 +2,10 @@ source "https://rubygems.org"
 
 gemspec
 
-gem("minitest", "~> 5.15")
-gem("rake-compiler", "~> 1.2.0")
+gem("minitest", "5.20.0")
+gem("rake-compiler", "1.2.5")
 gem("rake-compiler-dock", "1.3.0")
-gem("rdoc", ">= 4.0", "< 7")
-gem("psych", "~> 4.0") # psych 5 doesn't build on some CI platforms yet
+gem("rdoc", "6.5.0")
+gem("psych", "5.1.0")
 
 gem("ruby_memcheck", "2.1.2") if Gem::Platform.local.os == "linux"