Use Oracle Instant Client 21.4

Refer
https://www.oracle.com/database/technologies/instant-client/linux-x86-64-downloads.html

Author: yahonda

.github/workflows/test.yml

@@ -23,8 +23,8 @@ jobs:
           '2.7'
         ]
     env:
-      ORACLE_HOME: /usr/lib/oracle/18.5/client64
-      LD_LIBRARY_PATH: /usr/lib/oracle/18.5/client64/lib
+      ORACLE_HOME: /usr/lib/oracle/21/client64
+      LD_LIBRARY_PATH: /usr/lib/oracle/21/client64/lib
       NLS_LANG: AMERICAN_AMERICA.AL32UTF8
       TNS_ADMIN: ./ci/network/admin
       DATABASE_NAME: XEPDB1
@@ -57,14 +57,14 @@ jobs:
         sudo apt-get install alien
     - name: Download Oracle client
       run: |
-        wget -q https://download.oracle.com/otn_software/linux/instantclient/185000/oracle-instantclient18.5-basic-18.5.0.0.0-3.x86_64.rpm
-        wget -q https://download.oracle.com/otn_software/linux/instantclient/185000/oracle-instantclient18.5-sqlplus-18.5.0.0.0-3.x86_64.rpm
-        wget -q https://download.oracle.com/otn_software/linux/instantclient/185000/oracle-instantclient18.5-devel-18.5.0.0.0-3.x86_64.rpm
+        wget -q https://download.oracle.com/otn_software/linux/instantclient/214000/oracle-instantclient-basic-21.4.0.0.0-1.x86_64.rpm
+        wget -q https://download.oracle.com/otn_software/linux/instantclient/214000/oracle-instantclient-sqlplus-21.4.0.0.0-1.x86_64.rpm
+        wget -q https://download.oracle.com/otn_software/linux/instantclient/214000/oracle-instantclient-devel-21.4.0.0.0-1.x86_64.rpm
     - name: Install Oracle client
       run: |
-        sudo alien -i oracle-instantclient18.5-basic-18.5.0.0.0-3.x86_64.rpm
-        sudo alien -i oracle-instantclient18.5-sqlplus-18.5.0.0.0-3.x86_64.rpm
-        sudo alien -i oracle-instantclient18.5-devel-18.5.0.0.0-3.x86_64.rpm
+        sudo alien -i oracle-instantclient-basic-21.4.0.0.0-1.x86_64.rpm
+        sudo alien -i oracle-instantclient-sqlplus-21.4.0.0.0-1.x86_64.rpm
+        sudo alien -i oracle-instantclient-devel-21.4.0.0.0-1.x86_64.rpm
     - name: Install JDBC Driver
       run: |
         wget -q https://download.oracle.com/otn-pub/otn_software/jdbc/211/ojdbc11.jar -O ./lib/ojdbc11.jar