Bump the backend group across 1 directory with 6 updates (#178)

Bumps the backend group with 6 updates in the / directory:

| Package | From | To |
| --- | --- | --- |
| [org.springframework.boot:spring-boot-starter-parent](https://github.com/spring-projects/spring-boot) | `3.3.4` | `3.3.5` |
| [org.springframework.boot:spring-boot-dependencies](https://github.com/spring-projects/spring-boot) | `3.3.4` | `3.3.5` |
| [org.springframework.boot:spring-boot-maven-plugin](https://github.com/spring-projects/spring-boot) | `3.3.4` | `3.3.5` |
| [org.mariadb:r2dbc-mariadb](https://github.com/mariadb-corporation/mariadb-connector-r2dbc) | `1.2.2` | `1.3.0` |
| [org.flywaydb:flyway-core](https://github.com/flyway/flyway) | `10.19.0` | `10.20.1` |
| org.flywaydb:flyway-mysql | `10.19.0` | `10.20.1` |



Updates `org.springframework.boot:spring-boot-starter-parent` from 3.3.4 to 3.3.5
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.3.4...v3.3.5)

Updates `org.springframework.boot:spring-boot-dependencies` from 3.3.4 to 3.3.5
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.3.4...v3.3.5)

Updates `org.springframework.boot:spring-boot-maven-plugin` from 3.3.4 to 3.3.5
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.3.4...v3.3.5)

Updates `org.mariadb:r2dbc-mariadb` from 1.2.2 to 1.3.0
- [Release notes](https://github.com/mariadb-corporation/mariadb-connector-r2dbc/releases)
- [Changelog](https://github.com/mariadb-corporation/mariadb-connector-r2dbc/blob/master/CHANGELOG.md)
- [Commits](mariadb-corporation/mariadb-connector-r2dbc@1.2.2...1.3.0)

Updates `org.flywaydb:flyway-core` from 10.19.0 to 10.20.1
- [Release notes](https://github.com/flyway/flyway/releases)
- [Commits](flyway/flyway@flyway-10.19.0...flyway-10.20.1)

Updates `org.flywaydb:flyway-mysql` from 10.19.0 to 10.20.1

Updates `org.flywaydb:flyway-mysql` from 10.19.0 to 10.20.1

Updates `org.springframework.boot:spring-boot-maven-plugin` from 3.3.4 to 3.3.5
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.3.4...v3.3.5)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-starter-parent
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: backend
- dependency-name: org.springframework.boot:spring-boot-dependencies
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: backend
- dependency-name: org.springframework.boot:spring-boot-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: backend
- dependency-name: org.mariadb:r2dbc-mariadb
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: backend
- dependency-name: org.flywaydb:flyway-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: backend
- dependency-name: org.flywaydb:flyway-mysql
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: backend
- dependency-name: org.flywaydb:flyway-mysql
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: backend
- dependency-name: org.springframework.boot:spring-boot-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: backend
...

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

pom.xml

@@ -6,7 +6,7 @@
   <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
-    <version>3.3.4</version>
+    <version>3.3.5</version>
     <relativePath/><!-- lookup parent from repository -->
   </parent>
 
@@ -44,11 +44,11 @@
     <maven-jacoco-plugin.version>0.8.12</maven-jacoco-plugin.version>
 
     <!-- 3rd-party library versions -->
-    <spring-boot-bom.version>3.3.4</spring-boot-bom.version>
+    <spring-boot-bom.version>3.3.5</spring-boot-bom.version>
     <junixsocket.version>2.10.1</junixsocket.version>
-    <flyway.version>10.19.0</flyway.version>
+    <flyway.version>10.20.1</flyway.version>
     <r2dbc-mysql.version>1.3.0</r2dbc-mysql.version>
-    <r2dbc-mariadb.version>1.2.2</r2dbc-mariadb.version>
+    <r2dbc-mariadb.version>1.3.0</r2dbc-mariadb.version>
   </properties>
 
   <build>