refactor: drop dead query local assignments in resources

Five resource methods (image build/pull, plugin pull/upgrade, service update)
assigned `query = encode_query_params(parsed)` but built the request query
inline via `parsed.slice(*query_params)`, leaving the local unused. RuboCop
flagged Lint/UselessAssignment, failing CI. Remove the dead assignments — no
behavior change, the requests already send their query params.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: mokevnin

Gemfile.lock

@@ -56,12 +56,12 @@ GEM
     csv (3.3.5)
     drb (2.2.3)
     erubi (1.13.1)
-    ffi (1.17.2-aarch64-linux-gnu)
-    ffi (1.17.2-aarch64-linux-musl)
-    ffi (1.17.2-arm64-darwin)
-    ffi (1.17.2-x86_64-darwin)
-    ffi (1.17.2-x86_64-linux-gnu)
-    ffi (1.17.2-x86_64-linux-musl)
+    ffi (1.17.4-aarch64-linux-gnu)
+    ffi (1.17.4-aarch64-linux-musl)
+    ffi (1.17.4-arm64-darwin)
+    ffi (1.17.4-x86_64-darwin)
+    ffi (1.17.4-x86_64-linux-gnu)
+    ffi (1.17.4-x86_64-linux-musl)
     fiber-annotation (0.2.0)
     fiber-local (1.1.0)
       fiber-storage
@@ -79,7 +79,7 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.10)
     logger (1.7.0)
     metrics (0.15.0)
-    minitest (5.26.0)
+    minitest (5.27.0)
     minitest-focus (1.4.0)
       minitest (>= 4, < 6)
     minitest-hooks (1.5.2)
@@ -181,7 +181,7 @@ GEM
       concurrent-ruby (~> 1.0)
     unicode-display_width (3.2.0)
       unicode-emoji (~> 4.1)
-    unicode-emoji (4.1.0)
+    unicode-emoji (4.2.0)
     uri (1.1.0)
     webmock (3.26.1)
       addressable (>= 2.8.0)

lib/docker_engine_ruby/resources/images.rb

@@ -147,7 +147,6 @@ def build(params)
             :version
           ]
         parsed, options = DockerEngineRuby::ImageBuildParams.dump_request(params)
-        query = DockerEngineRuby::Internal::Util.encode_query_params(parsed)
         @client.request(
           method: :post,
           path: "build",
@@ -457,7 +456,6 @@ def prune(params = {})
       def pull(params)
         query_params = [:changes, :from_image, :from_src, :message, :platform, :repo, :tag]
         parsed, options = DockerEngineRuby::ImagePullParams.dump_request(params)
-        query = DockerEngineRuby::Internal::Util.encode_query_params(parsed)
         @client.request(
           method: :post,
           path: "images/create",

lib/docker_engine_ruby/resources/plugins.rb

@@ -182,7 +182,6 @@ def privileges(params)
       def pull(params)
         query_params = [:remote, :name]
         parsed, options = DockerEngineRuby::PluginPullParams.dump_request(params)
-        query = DockerEngineRuby::Internal::Util.encode_query_params(parsed)
         @client.request(
           method: :post,
           path: "plugins/pull",
@@ -255,7 +254,6 @@ def set(name, params)
       def upgrade(name, params)
         query_params = [:remote]
         parsed, options = DockerEngineRuby::PluginUpgradeParams.dump_request(params)
-        query = DockerEngineRuby::Internal::Util.encode_query_params(parsed)
         @client.request(
           method: :post,
           path: ["plugins/%1$s/upgrade", name],

lib/docker_engine_ruby/resources/services.rb

@@ -52,7 +52,6 @@ def create(params)
       def update(id, params)
         query_params = [:version, :registry_auth_from, :rollback]
         parsed, options = DockerEngineRuby::ServiceUpdateParams.dump_request(params)
-        query = DockerEngineRuby::Internal::Util.encode_query_params(parsed)
         @client.request(
           method: :post,
           path: ["services/%1$s/update", id],