Update dependency io.pebbletemplates:pebble to v4 (#1458)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [io.pebbletemplates:pebble](http://pebbletemplates.io)
([source](https://redirect.github.com/PebbleTemplates/pebble)) | `3.2.4`
-> `4.0.0` |
[![age](https://developer.mend.io/api/mc/badges/age/maven/io.pebbletemplates:pebble/4.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/io.pebbletemplates:pebble/3.2.4/4.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>PebbleTemplates/pebble (io.pebbletemplates:pebble)</summary>

###
[`v4.0.0`](https://redirect.github.com/PebbleTemplates/pebble/releases/tag/4.0.0)

[Compare
Source](https://redirect.github.com/PebbleTemplates/pebble/compare/3.2.4...v4.0.0)

### BREAKING CHANGES

- Add support for spring boot 4
([#&#8203;704](https://redirect.github.com/PebbleTemplates/pebble/issues/704))
- Use one of the following artifactId according to the spring boot
version that you are using

| ArtifactId                        | spring-boot version |
| --------------------------------- | ------------------- |
| pebble-legacy-spring-boot-starter | 3.x.x               |
| pebble-spring-boot-starter        | 4.x.x               |

- The following spring boot properties has been moved to `.servlet` or
`.reactive`

| Old property | New Property |
| ------------------------------- |
--------------------------------------- |
| pebble.allowRequestOverride | pebble.servlet.allowRequestOverride |
| pebble.allowSessionOverride | pebble.servlet.allowSessionOverride |
| pebble.cache | pebble.servlet.cache |
| pebble.contentType | pebble.servlet.contentType |
| pebble.exposeRequestAttributes |
pebble.servlet.exposeRequestAttributes |
| pebble.exposeSessionAttributes |
pebble.servlet.exposeSessionAttributes |
| pebble.exposeSpringMacroHelpers |
pebble.servlet.exposeSpringMacroHelpers |
| | pebble.reactive.mediaTypes |

For more information, please consult the spring-boot integration
documentation in
the [Boot externalized configuration
section](https://pebbletemplates.io/wiki/guide/spring-boot-integration/)

### New Features

- Add nl2br filter
([#&#8203;699](https://redirect.github.com/PebbleTemplates/pebble/issues/699))

</details>

---

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♻ **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
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---

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this box

---

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generator/pom.xml

@@ -135,7 +135,7 @@
         <dependency>
             <groupId>io.pebbletemplates</groupId>
             <artifactId>pebble</artifactId>
-            <version>3.2.4</version>
+            <version>4.0.0</version>
         </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>