drop support for JRuby 9.1 (min is 9.2 now)

Author: kares

.github/workflows/ci-test.yml

@@ -14,10 +14,8 @@ jobs:
     strategy:
       matrix:
         java-version: [ 8, 11, 21 ]
-        ruby-version: [ jruby-9.4.6.0 ]
+        ruby-version: [ jruby-9.4.7.0 ]
         include:
-          - java-version: 8
-            ruby-version: jruby-9.1.17.0
           - java-version: 8
             ruby-version: jruby-9.2.19.0
           - java-version: 11
@@ -31,7 +29,7 @@ jobs:
           - java-version: 11
             ruby-version: jruby-9.4.5.0
           - java-version: 17
-            ruby-version: jruby-9.4.5.0
+            ruby-version: jruby-9.4.6.0
       fail-fast: false
 
     steps:

jruby-openssl.gemspec

@@ -25,7 +25,7 @@ Gem::Specification.new do |s|
   bc_version = version_rb.match( /.*\sBOUNCY_CASTLE_VERSION\s*=\s*['"](.*)['"]/ )[1]
   raise 'BOUNCY_CASTLE_VERSION not matched' if (bc_version || '').empty?
 
-  s.required_ruby_version = '>= 2.3.0'
+  s.required_ruby_version = '>= 2.5.0' # JRuby >= 9.2
 
   s.requirements << "jar org.bouncycastle:bcprov-jdk18on, #{bc_version}" # Provider
   s.requirements << "jar org.bouncycastle:bcpkix-jdk18on, #{bc_version}" # PKIX/CMS/EAC/PKCSOCSP/TSP/OPENSSL