Add Java 26 to test matrix

Author: headius

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         target: ['test:jruby:int', 'spec:ruby:fast', 'spec:ji', 'spec:ffi', 'test:mri:core:jit', 'test:mri:extra', 'spec:ruby:fast:jit', 'test:mri:stdlib', 'spec:ruby:slow', 'spec:ruby:debug', 'test:jruby:aot', 'test:slow_suites', 'spec:compiler', 'spec:regression', 'spec:jrubyc', 'spec:profiler']
-        java-version: ['21', '25']
+        java-version: ['21', '25', '26']
       fail-fast: false
 
     name: rake ${{ matrix.target }} (Java ${{ matrix.java-version }})
@@ -46,7 +46,7 @@ jobs:
       matrix:
         target: ['spec:jruby']
         platform: ['ubuntu-latest', 'macos-latest']
-        java-version: ['21', '25']
+        java-version: ['21', '25', '26']
       fail-fast: false
 
     name: rake ${{ matrix.target }} (Java ${{ matrix.java-version }})
@@ -128,7 +128,7 @@ jobs:
     strategy:
       matrix:
         target: ['test:mri:core:jit', 'test:jruby:jit', 'spec:compiler', 'spec:ruby:fast:jit', 'spec:ji']
-        java-version: ['21', '25']
+        java-version: ['21', '25', '26']
       fail-fast: false
 
     name: rake ${{ matrix.target }} (Java ${{ matrix.java-version }} -indy)