build(deps): bump com.puppycrawl.tools:checkstyle (#46)

Bumps [com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle) from 10.21.4 to 10.26.1.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-10.21.4...checkstyle-10.26.1)

---
updated-dependencies:
- dependency-name: com.puppycrawl.tools:checkstyle
  dependency-version: 10.26.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

buildSrc/build.gradle

@@ -8,7 +8,7 @@ repositories {
 
 dependencies {
     implementation "com.github.spotbugs.snom:spotbugs-gradle-plugin:6.0.22"
-    implementation "com.puppycrawl.tools:checkstyle:10.21.4"
+    implementation "com.puppycrawl.tools:checkstyle:10.26.1"
     implementation "io.freefair.gradle:lombok-plugin:8.14"
     implementation "io.github.boolivar.jdoctest.jdoc-spock:io.github.boolivar.jdoctest.jdoc-spock.gradle.plugin:0.11.0"
     implementation "net.sourceforge.pmd:pmd-java:7.11.0"