Spring Boot 3.5 to 4.0

Polish!

Spring Boot 3.3.3 to 3.4.0

Gradle 8.10.1 to 8.11.1

Fixed flaw in changing environment variables at start-up.

Spring Boot 3.1 to 3.3

Java 17 to 21
Gradle 8.1 to 8.7

Merge pull request #20 from jkazama/v3.1

v3.1.1

Merge pull request #19 from jkazama/v3

Spring Boot 2.7 to 3.0

Spring Boot 2.6 to 2.7

Gradle 7.3 to 7.4.2

Spring Boot 2.5 to 2.6

Gradle 7.0 to 7.3

Java 8 to 11

Spring Boot 2.4.0 to 2.5.0
Gradle 6.7 to 7.0.2
JCenter to MavenCentral