[hotfix][ci] Update ci to include 1.20.0

Author: z3d1k

.github/workflows/nightly.yml

@@ -25,7 +25,7 @@ jobs:
     if: github.repository_owner == 'apache'
     strategy:
       matrix:
-        flink: [1.18-SNAPSHOT, 1.19-SNAPSHOT, 1.20-SNAPSHOT]
+        flink: [1.19-SNAPSHOT, 1.20-SNAPSHOT]
         java: [ '8, 11, 17']
     uses: ./.github/workflows/common.yml
     with:
@@ -38,7 +38,7 @@ jobs:
   python_test:
     strategy:
       matrix:
-        flink: [1.18-SNAPSHOT, 1.19-SNAPSHOT, 1.20-SNAPSHOT]
+        flink: [1.19-SNAPSHOT, 1.20-SNAPSHOT]
     uses: apache/flink-connector-shared-utils/.github/workflows/python_ci.yml@ci_utils
     with:
       flink_version: ${{ matrix.flink }}

.github/workflows/push_pr.yml

@@ -26,7 +26,7 @@ jobs:
     uses: ./.github/workflows/common.yml
     strategy:
       matrix:
-        flink: [1.18.1, 1.19.1]
+        flink: [1.19.1, 1.20.0]
         java: [ '8, 11, 17']
     with:
       flink_version: ${{ matrix.flink }}
@@ -38,7 +38,7 @@ jobs:
   python_test:
     strategy:
       matrix:
-        flink: [1.18.1, 1.19.1]
+        flink: [1.19.0, 1.20.0]
     uses: apache/flink-connector-shared-utils/.github/workflows/python_ci.yml@ci_utils
     with:
       flink_version: ${{ matrix.flink }}