appveyor: Try to fix AppVeyor failure

Signed-off-by: Hiroshi Hatake <[email protected]>

appveyor.yml

@@ -21,17 +21,29 @@ test_script:
 environment:
   matrix:
     - ruby_version: "31-x64"
+      reinstall_bundler: 0
     - ruby_version: "31"
+      reinstall_bundler: 0
     - ruby_version: "30-x64"
+      reinstall_bundler: 0
     - ruby_version: "30"
+      reinstall_bundler: 0
     - ruby_version: "27-x64"
+      reinstall_bundler: 1
     - ruby_version: "27"
+      reinstall_bundler: 1
     - ruby_version: "26-x64"
+      reinstall_bundler: 1
     - ruby_version: "26"
+      reinstall_bundler: 1
     - ruby_version: "25-x64"
+      reinstall_bundler: 0
     - ruby_version: "25"
+      reinstall_bundler: 0
     - ruby_version: "24-x64"
+      reinstall_bundler: 0
     - ruby_version: "24"
+      reinstall_bundler: 0
 
 for:
 -
@@ -43,6 +55,10 @@ for:
     - ruby --version
     - gem --version
     - bundle --version
+    - if %reinstall_bundler% equ 1 (
+        gem uninstall bundler &
+        gem install bundler -v 2.4.22
+      )
     - ridk.cmd install 1 3
     - ridk.cmd exec bundle install
     - ridk.cmd exec bundle exec rake compile