ci: unbreak show-spring-boot-version-diff.sh script by pinning Spring Boot version

Relate to #1632

Author: php-coder

src/main/scripts/show-spring-boot-version-diff.sh

@@ -13,7 +13,9 @@ set -o pipefail
 
 CURRENT_DIR="$(dirname "$0")"
 PROJECT_POM="$CURRENT_DIR/../../../pom.xml"
-SPRING_VERSION="$(grep -FA1 '<artifactId>spring-boot-starter-parent' "$PROJECT_POM" | awk -F'[<>]' '/<version>/{print $3}')"
+
+SPRING_VERSION='2.2.13.RELEASE'
+#SPRING_VERSION="$(grep -FA1 '<artifactId>spring-boot-starter-parent' "$PROJECT_POM" | awk -F'[<>]' '/<version>/{print $3}')"
 
 # @todo #869 show-spring-boot-version-diff.sh: properly handle recursive properties
 SPRING_POM="https://raw.githubusercontent.com/spring-projects/spring-boot/v$SPRING_VERSION/spring-boot-project/spring-boot-dependencies/pom.xml"