chore(deps): update dependency org.springframework.boot:spring-boot-gradle-plugin to v3.4.4 (#1575)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[org.springframework.boot:spring-boot-gradle-plugin](https://spring.io/projects/spring-boot)
([source](https://redirect.github.com/spring-projects/spring-boot)) |
`3.4.3` -> `3.4.4` |
[![age](https://developer.mend.io/api/mc/badges/age/maven/org.springframework.boot:spring-boot-gradle-plugin/3.4.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/org.springframework.boot:spring-boot-gradle-plugin/3.4.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/org.springframework.boot:spring-boot-gradle-plugin/3.4.3/3.4.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/org.springframework.boot:spring-boot-gradle-plugin/3.4.3/3.4.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>spring-projects/spring-boot
(org.springframework.boot:spring-boot-gradle-plugin)</summary>

###
[`v3.4.4`](https://redirect.github.com/spring-projects/spring-boot/compare/v3.4.3...v3.4.4)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/line/line-bot-sdk-java).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOS4yMDcuMSIsInVwZGF0ZWRJblZlciI6IjM5LjIwNy4xIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIiwibGFiZWxzIjpbImRlcGVuZGVuY3kgdXBncmFkZSJdfQ==-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

buildSrc/build.gradle.kts

@@ -15,7 +15,7 @@ dependencies {
     implementation("io.github.gradle-nexus:publish-plugin:2.0.0")
     implementation("org.openapitools:openapi-generator-gradle-plugin:7.12.0")
     implementation("com.github.spotbugs.snom:spotbugs-gradle-plugin:6.1.7")
-    implementation("org.springframework.boot:spring-boot-gradle-plugin:3.4.3")
+    implementation("org.springframework.boot:spring-boot-gradle-plugin:3.4.4")
 
     // workaround to use libs in a precompiled script plugin.
     // https://github.com/gradle/gradle/issues/15383