Bump version number and prepare changelog for 7.3

Merged-by: Martin Grzenia <martin.grzenia@iml.fraunhofer.de>

Author: swltr

gradle/common.gradle

@@ -21,7 +21,7 @@ else if (System.env.CI_PIPELINE_IID) {
 // - The minor version number should be incremented when new feature were added.
 // - The patch level should be incremented with every small change to the code
 //   (e.g. bugfixes).
-project.version = "7.2.0"
+project.version = "7.3.0"
 if (!(project.hasProperty("NO_BUILD_NUMBER")
     && Boolean.valueOf(project.getProperties().get("NO_BUILD_NUMBER")))) {
   project.version += "-$versionBuild"

opentcs-documentation/src/docs/release-notes/changelog.adoc

@@ -16,6 +16,10 @@ The openTCS developers
 This change log lists the most relevant changes for past releases in reverse chronological order.
 (Note that the openTCS project adheres to https://semver.org/[Semantic Versioning].)
 
+== Unreleased
+
+...
+
 == Version 7.2 (2026-02-02)
 
 * New features and enhancements: