Add bugfixes announcement

Author: damianmalczewski

blog/2026-01-13-problem4j-small-bugfixes.md

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+---
+slug: 2026-01-13-problem4j-small-bugfixes
+title: Problem4J Small Bugfixes
+authors: malczuuu
+tags: [release]
+---
+
+Hi everyone 👋
+
+A minor patches were released. See releases on GitHub repositories for release notes.
+
+<!-- truncate -->
+
+- [`problem4j-core-v1.3.1`](https://github.com/problem4j/problem4j-core/releases/tag/v1.3.1)
+- [`problem4j-jackson-v1.3.1`](https://github.com/problem4j/problem4j-jackson/releases/tag/v1.3.1)
+- [`problem4j-spring-v1.2.1`](https://github.com/problem4j/problem4j-spring/releases/tag/v1.2.1)
+- [`problem4j-spring-v2.1.1`](https://github.com/problem4j/problem4j-spring/releases/tag/v2.1.1)