Use openjdk 21

Author: kannanjgithub

buildscripts/kokoro/windows32.bat

@@ -18,7 +18,7 @@ set JAVA_HOME=
 
 mkdir grpc-java-helper32
 cd grpc-java-helper32
-call "%VS170COMNTOOLS%\..\..\VC\Auxiliary\Build\vcvars32.bat" || exit /b 1
+call "%VS140COMNTOOLS%\vsvars32.bat" || exit /b 1
 call "%WORKSPACE%\buildscripts\make_dependencies.bat" || exit /b 1
 
 cd "%WORKSPACE%"

buildscripts/kokoro/windows64.bat

@@ -17,7 +17,7 @@ set JAVA_HOME=
 
 mkdir grpc-java-helper64
 cd grpc-java-helper64
-call "%VS170COMNTOOLS%\..\..\VC\Auxiliary\Build\vcvars64.bat" || exit /b 1
+call "%VS140COMNTOOLS%\vsvars64.bat" || exit /b 1
 call "%WORKSPACE%\buildscripts\make_dependencies.bat" || exit /b 1
 
 cd "%WORKSPACE%"

buildscripts/make_dependencies.bat

@@ -1,8 +1,8 @@
 echo on
 @rem set PROTOBUF_VER=21.7
 choco install -y gradle git curl pkgconfiglite
-choco install -y openjdk --version=22.0.2
-set PATH=%PATH%;"c:\Program Files\OpenJDK\jdk-22.0.2\bin"
+choco install -y openjdk --version=21.0
+set PATH=%PATH%;"c:\Program Files\OpenJDK\jdk-21\bin"
 set JAVA_HOME=
 set PROTOBUF_VER=22.5
 set ABSL_VERSION=20230125.4