Bump bouncycastleVersion from 1.80 to 1.81 (#3673)

Bumps `bouncycastleVersion` from 1.80 to 1.81.
Updates `org.bouncycastle:bcprov-jdk18on` from 1.80 to 1.81
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/bcgit/bc-java/blob/main/docs/releasenotes.html">org.bouncycastle:bcprov-jdk18on's
changelog</a>.</em></p>
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<p><!-- raw HTML omitted --><!-- raw HTML omitted -->2.1.1 Version<!--
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Release: 1.81<!-- raw HTML omitted -->
Date:      2025, 4th June.</p>
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</blockquote>
<p>... (truncated)</p>
</details>
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Updates `org.bouncycastle:bcpkix-jdk18on` from 1.80 to 1.81
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/bcgit/bc-java/blob/main/docs/releasenotes.html">org.bouncycastle:bcpkix-jdk18on's
changelog</a>.</em></p>
<blockquote>
<!-- raw HTML omitted -->
<!-- raw HTML omitted -->
<!-- raw HTML omitted -->
<p><!-- raw HTML omitted --><!-- raw HTML omitted -->2.1.1 Version<!--
raw HTML omitted --><!-- raw HTML omitted -->
Release: 1.81<!-- raw HTML omitted -->
Date:      2025, 4th June.</p>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a
href="https://github.com/bcgit/bc-java/commits">compare view</a></li>
</ul>
</details>
<br />


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build.gradle

@@ -23,7 +23,7 @@ ext {
     pdfboxVersion = "3.0.5"
     imageioVersion = "3.12.0"
     lombokVersion = "1.18.38"
-    bouncycastleVersion = "1.80"
+    bouncycastleVersion = "1.81"
     springSecuritySamlVersion = "6.5.0"
     openSamlVersion = "4.3.2"
     commonmarkVersion = "0.24.0"

proprietary/build.gradle

@@ -21,7 +21,7 @@ dependencies {
     implementation 'com.bucket4j:bucket4j_jdk17-core:8.14.0'
 
     // https://mvnrepository.com/artifact/com.bucket4j/bucket4j_jdk17
-    implementation 'org.bouncycastle:bcprov-jdk18on:1.80'
+    implementation 'org.bouncycastle:bcprov-jdk18on:1.81'
 
     implementation 'org.thymeleaf.extras:thymeleaf-extras-springsecurity5:3.1.3.RELEASE'
     api 'io.micrometer:micrometer-registry-prometheus'