Bump kotlin.version from 1.6.21 to 1.7.0 (#220)

Bumps `kotlin.version` from 1.6.21 to 1.7.0.

Updates `kotlin-stdlib-jdk8` from 1.6.21 to 1.7.0
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/commits)

Updates `kotlin-reflect` from 1.6.21 to 1.7.0
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/commits)

Updates `kotlin-maven-allopen` from 1.6.21 to 1.7.0

Updates `kotlin-maven-noarg` from 1.6.21 to 1.7.0

Updates `kotlin-maven-plugin` from 1.6.21 to 1.7.0

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-stdlib-jdk8
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.jetbrains.kotlin:kotlin-reflect
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.jetbrains.kotlin:kotlin-maven-allopen
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.jetbrains.kotlin:kotlin-maven-noarg
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.jetbrains.kotlin:kotlin-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

backend/pom.xml

@@ -14,7 +14,7 @@
         <maven.compiler.source>17</maven.compiler.source>
         <maven.compiler.target>17</maven.compiler.target>
         <java.version>17</java.version>
-        <kotlin.version>1.6.21</kotlin.version>
+        <kotlin.version>1.7.0</kotlin.version>
 
         <spring.boot.version>2.7.0</spring.boot.version>
         <jjwt.version>0.11.5</jjwt.version>