Update Java verstion to 17 since Spring Boot 3 only supports Java 17

Author: ynojima

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        java_version: [8]
+        java_version: [17]
         os: [windows-latest]
 
     steps:
@@ -36,7 +36,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        java_version: [8, 11, 17]
+        java_version: [17]
         os: [windows-latest] # , macOS-latest (remove macOS as it is not stable for now) , ubuntu-latest (remove Ubuntu as Chrome 77 doesn't work
 
     steps:
@@ -56,7 +56,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        java_version: [11]
+        java_version: [17]
         os: [windows-latest]
 
     steps:

.github/workflows/pr-gate-ci.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        java_version: [8]
+        java_version: [17]
         os: [windows-latest]
 
     steps:
@@ -28,7 +28,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        java_version: [8, 11, 17]
+        java_version: [17]
         os: [windows-latest] # , macOS-latest (remove macOS as it is not stable for now)
 
     steps:
@@ -48,7 +48,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        java_version: [11]
+        java_version: [17]
         os: [windows-latest]
 
     steps:

.github/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        java_version: [8]
+        java_version: [17]
         os: [windows-latest]
 
     steps:

.github/workflows/snapshot-release.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        java_version: [8]
+        java_version: [17]
         os: [windows-latest]
 
     steps: