Bump the standard-plugins group with 6 updates

Bumps the standard-plugins group with 6 updates:

| Package | From | To |
| --- | --- | --- |
| [org.codehaus.mojo:flatten-maven-plugin](https://github.com/mojohaus/flatten-maven-plugin) | `1.7.1` | `1.7.3` |
| [org.apache.maven.plugins:maven-surefire-plugin](https://github.com/apache/maven-surefire) | `3.5.3` | `3.5.4` |
| [org.apache.maven.plugins:maven-failsafe-plugin](https://github.com/apache/maven-surefire) | `3.5.3` | `3.5.4` |
| [org.apache.maven.plugins:maven-source-plugin](https://github.com/apache/maven-source-plugin) | `3.3.1` | `3.4.0` |
| [org.apache.maven.plugins:maven-javadoc-plugin](https://github.com/apache/maven-javadoc-plugin) | `3.11.2` | `3.12.0` |
| [org.apache.maven.plugins:maven-gpg-plugin](https://github.com/apache/maven-gpg-plugin) | `3.2.7` | `3.2.8` |


Updates `org.codehaus.mojo:flatten-maven-plugin` from 1.7.1 to 1.7.3
- [Release notes](https://github.com/mojohaus/flatten-maven-plugin/releases)
- [Commits](mojohaus/flatten-maven-plugin@1.7.1...1.7.3)

Updates `org.apache.maven.plugins:maven-surefire-plugin` from 3.5.3 to 3.5.4
- [Release notes](https://github.com/apache/maven-surefire/releases)
- [Commits](apache/maven-surefire@surefire-3.5.3...surefire-3.5.4)

Updates `org.apache.maven.plugins:maven-failsafe-plugin` from 3.5.3 to 3.5.4
- [Release notes](https://github.com/apache/maven-surefire/releases)
- [Commits](apache/maven-surefire@surefire-3.5.3...surefire-3.5.4)

Updates `org.apache.maven.plugins:maven-source-plugin` from 3.3.1 to 3.4.0
- [Release notes](https://github.com/apache/maven-source-plugin/releases)
- [Commits](apache/maven-source-plugin@maven-source-plugin-3.3.1...maven-source-plugin-3.4.0)

Updates `org.apache.maven.plugins:maven-javadoc-plugin` from 3.11.2 to 3.12.0
- [Release notes](https://github.com/apache/maven-javadoc-plugin/releases)
- [Commits](apache/maven-javadoc-plugin@maven-javadoc-plugin-3.11.2...maven-javadoc-plugin-3.12.0)

Updates `org.apache.maven.plugins:maven-gpg-plugin` from 3.2.7 to 3.2.8
- [Release notes](https://github.com/apache/maven-gpg-plugin/releases)
- [Commits](apache/maven-gpg-plugin@maven-gpg-plugin-3.2.7...maven-gpg-plugin-3.2.8)

---
updated-dependencies:
- dependency-name: org.codehaus.mojo:flatten-maven-plugin
  dependency-version: 1.7.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: standard-plugins
- dependency-name: org.apache.maven.plugins:maven-surefire-plugin
  dependency-version: 3.5.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: standard-plugins
- dependency-name: org.apache.maven.plugins:maven-failsafe-plugin
  dependency-version: 3.5.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: standard-plugins
- dependency-name: org.apache.maven.plugins:maven-source-plugin
  dependency-version: 3.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: standard-plugins
- dependency-name: org.apache.maven.plugins:maven-javadoc-plugin
  dependency-version: 3.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: standard-plugins
- dependency-name: org.apache.maven.plugins:maven-gpg-plugin
  dependency-version: 3.2.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: standard-plugins
...

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

Author: dependabot[bot]

pom.xml

@@ -59,14 +59,14 @@
         <maven.compiler.target>17</maven.compiler.target>
 
         <!-- plugin versions -->
-        <flatten-maven-plugin.version>1.7.1</flatten-maven-plugin.version>
-        <maven-surefire-plugin.version>3.5.3</maven-surefire-plugin.version>
-        <maven-failsafe-plugin.version>3.5.3</maven-failsafe-plugin.version>
-        <maven-source-plugin.version>3.3.1</maven-source-plugin.version>
+        <flatten-maven-plugin.version>1.7.3</flatten-maven-plugin.version>
+        <maven-surefire-plugin.version>3.5.4</maven-surefire-plugin.version>
+        <maven-failsafe-plugin.version>3.5.4</maven-failsafe-plugin.version>
+        <maven-source-plugin.version>3.4.0</maven-source-plugin.version>
         <maven-install-plugin.version>3.1.4</maven-install-plugin.version>
         <maven-deploy-plugin.version>3.1.4</maven-deploy-plugin.version>
-        <maven-javadoc-plugin.version>3.11.2</maven-javadoc-plugin.version>
-        <maven-gpg-plugin.version>3.2.7</maven-gpg-plugin.version>
+        <maven-javadoc-plugin.version>3.12.0</maven-javadoc-plugin.version>
+        <maven-gpg-plugin.version>3.2.8</maven-gpg-plugin.version>
         <central-publishing-maven-plugin.version>0.8.0</central-publishing-maven-plugin.version>
 
         <!-- dependency versions -->