Bump org.aspectj:aspectjrt from 1.9.8 to 1.9.21.1 (#16)

Bumps [org.aspectj:aspectjrt](https://github.com/eclipse/org.aspectj)
from 1.9.8 to 1.9.21.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/eclipse/org.aspectj/releases">org.aspectj:aspectjrt's
releases</a>.</em></p>
<blockquote>
<h2>1.9.21.1</h2>
<p>Java 21 maintenance release.</p>
<p>For load-time weaving (LTW) on JDK 16+, using
<code>--add-opens</code> is no longer necessary!</p>
<p><a
href="https://github.com/eclipse-aspectj/aspectj/blob/master/docs/release/README-1.9.21.adoc">AspectJ
1.9.21 release notes</a></p>
<h2>1.9.21</h2>
<p>Java 21.</p>
<p><a
href="https://github.com/eclipse-aspectj/aspectj/blob/master/docs/release/README-1.9.21.adoc">AspectJ
1.9.21 release notes</a></p>
<h2>1.9.20.1</h2>
<p>Java 20 bugfix release.</p>
<p><a
href="https://github.com/eclipse-aspectj/aspectj/blob/master/docs/release/README-1.9.20.adoc">AspectJ
1.9.20.1 release notes</a></p>
<h2>1.9.20</h2>
<p>Java 20.</p>
<p><a
href="https://github.com/eclipse-aspectj/aspectj/blob/master/docs/release/README-1.9.20.adoc">AspectJ
1.9.20 release notes</a></p>
<h2>1.9.19</h2>
<p>Java 19.</p>
<p><a
href="https://github.com/eclipse-aspectj/aspectj/blob/master/docs/release/README-1.9.19.adoc">AspectJ
1.9.19 release notes</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a
href="https://github.com/eclipse/org.aspectj/commits">compare
view</a></li>
</ul>
</details>
<br />


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pom.xml

@@ -101,7 +101,7 @@
         <dependency>
             <groupId>org.aspectj</groupId>
             <artifactId>aspectjrt</artifactId>
-            <version>1.9.8</version>
+            <version>1.9.21.1</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>