Update gem dependencies to latest stable versions (#57)

- Pin docker-api to ~> 2.4 (from 1.34.2)
- Pin rake to ~> 13.0 (from 13.0.1)
- Pin rspec to ~> 3.13 (explicitly, was 3.8.0 via serverspec)
- Pin serverspec to ~> 2.43 (from 2.41.5)

Also adds Gemfile.lock to repository for reproducible builds.
The lockfile does not pin Bundler version to allow CI environments
to use their native Bundler version compatible with Ruby 3.4+.

Benefits:
- Security fixes and bug fixes from newer versions
- Better compatibility with modern Ruby versions
- Improved test stability
- Reproducible builds across environments

All tests pass successfully with updated dependencies.

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

Author: chorrell

Gemfile

@@ -1,5 +1,6 @@
 source "https://rubygems.org"
 
-gem 'docker-api'
-gem 'rake'
-gem 'serverspec'
+gem 'docker-api', '~> 2.4'
+gem 'rake', '~> 13.0'
+gem 'rspec', '~> 3.13'
+gem 'serverspec', '~> 2.43'

Gemfile.lock

@@ -0,0 +1,52 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    base64 (0.3.0)
+    diff-lcs (1.6.2)
+    docker-api (2.4.0)
+      excon (>= 0.64.0)
+      multi_json
+    excon (0.109.0)
+    multi_json (1.15.0)
+    net-scp (4.1.0)
+      net-ssh (>= 2.6.5, < 8.0.0)
+    net-ssh (7.3.0)
+    net-telnet (0.2.0)
+    rake (13.3.1)
+    rspec (3.13.2)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.6)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.5)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-its (1.3.1)
+      rspec-core (>= 3.0.0)
+      rspec-expectations (>= 3.0.0)
+    rspec-mocks (3.13.7)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.7)
+    serverspec (2.43.0)
+      multi_json
+      rspec (~> 3.0)
+      rspec-its
+      specinfra (~> 2.72)
+    sfl (2.3)
+    specinfra (2.94.1)
+      base64
+      net-scp
+      net-ssh (>= 2.7)
+      net-telnet
+      sfl
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  docker-api (~> 2.4)
+  rake (~> 13.0)
+  rspec (~> 3.13)
+  serverspec (~> 2.43)