ci: commit updated Gemfile.lock; drop unreleased rosetta 6.0.x arm

Every Test matrix job passed its tests but failed the final clean-tree
check on one line: ruby-runtime-test's Gemfile.lock needs updating
because the runtime gemspec's base64 dependency spec changed
('~> 0.2, >= 0.2.0' -> '~> 0.2'). Commit the regenerated lock.

pacmak-integration-test (6.0.x) fails with ERESOLVE: there is no
stable jsii-rosetta 6.0.x on npm (only 6.0.0-dev.0 under v6.0-next,
which satisfies neither the 6.0.x range nor jsii-pacmak's >=5.9.0
peer range). Drop the arm with a re-add note; latest and 5.9.x both
pass.

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

Author: Omar Qureshi

.github/workflows/main.yml

@@ -488,7 +488,9 @@ jobs:
         rosetta:
           - latest
           - 5.9.x
-          - 6.0.x
+          # 6.0.x: re-add once jsii-rosetta 6.0 has a stable release — npm
+          # currently only has 6.0.0-dev.0 (v6.0-next), which matches
+          # neither the 6.0.x range nor jsii-pacmak's >=5.9.0 peer range.
     steps:
       # Check out the code
       - name: Download Artifact

packages/@jsii/ruby-runtime-test/Gemfile.lock

@@ -2,7 +2,7 @@ PATH
   remote: ../ruby-runtime
   specs:
     jsii-ruby-runtime (0.0.0)
-      base64 (~> 0.2, >= 0.2.0)
+      base64 (~> 0.2)
 
 GEM
   remote: https://rubygems.org/