Bump actions/upload-artifact from 4 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/check.yml

@@ -35,7 +35,7 @@ jobs:
       env:
         _JAVA_OPTIONS: "-Xmx2048m -Xms512m"
         EMBULK_INPUT_MYSQL_TEST_CONFIG: "${{ github.workspace }}/ci/mysql.yml"
-    - uses: actions/upload-artifact@v4
+    - uses: actions/upload-artifact@v6
       if: always()
       with:
         name: mysql5_7
@@ -99,7 +99,7 @@ jobs:
       env:
         _JAVA_OPTIONS: "-Xmx2048m -Xms512m"
         EMBULK_INPUT_MYSQL_TEST_CONFIG: "${{ github.workspace }}/ci/mysql.yml"
-    - uses: actions/upload-artifact@v4
+    - uses: actions/upload-artifact@v6
       if: always()
       with:
         name: mysql8_3
@@ -140,7 +140,7 @@ jobs:
       env:
         _JAVA_OPTIONS: "-Xmx2048m -Xms512m"
         EMBULK_INPUT_POSTGRESQL_TEST_CONFIG: "${{ github.workspace }}/ci/postgresql.yml"
-    - uses: actions/upload-artifact@v4
+    - uses: actions/upload-artifact@v6
       if: always()
       with:
         name: postgresql9_4
@@ -187,7 +187,7 @@ jobs:
       env:
         _JAVA_OPTIONS: "-Xmx2048m -Xms512m"
         EMBULK_INPUT_POSTGRESQL_TEST_CONFIG: "${{ github.workspace }}/ci/postgresql.yml"
-    - uses: actions/upload-artifact@v4
+    - uses: actions/upload-artifact@v6
       if: always()
       with:
         name: postgresql13
@@ -229,7 +229,7 @@ jobs:
       env:
         _JAVA_OPTIONS: "-Xmx2048m -Xms512m"
         EMBULK_INPUT_REDSHIFT_TEST_CONFIG: "${{ github.workspace }}/ci/redshift.yml"
-    - uses: actions/upload-artifact@v4
+    - uses: actions/upload-artifact@v6
       if: always()
       with:
         name: redshift
@@ -289,7 +289,7 @@ jobs:
         _JAVA_OPTIONS: "-Xmx2048m -Xms512m"
         EMBULK_INPUT_SQLSERVER_TEST_CONFIG: "${{ github.workspace }}/ci/sqlserver.yml"
         EMBULK_INPUT_SQLSERVER_TEST_SQLCMD_COMMAND: "docker exec mssqlcontainer /opt/mssql-tools/bin/sqlcmd"
-    - uses: actions/upload-artifact@v4
+    - uses: actions/upload-artifact@v6
       if: always()
       with:
         name: sqlserver