Update bouncycastle to v1.81

[solrbot]

This PR contains the following updates:

Package	Type	Update	Change
org.bouncycastle:bcprov-jdk18on (source)	dependencies	minor	1.78.1 -> 1.81
org.bouncycastle:bcpkix-jdk18on (source)	dependencies	minor	1.78.1 -> 1.81

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This PR has been generated by Renovate Bot

[janhoy]

* What went wrong:
Could not determine the dependencies of task ':solr:modules:jwt-auth:collectJarInfos'.
> Could not resolve all dependencies for configuration ':solr:modules:jwt-auth:jarValidation'.
   > Could not resolve org.bouncycastle:bcpkix-jdk18on:1.80.
     Required by:
         project :solr:modules:jwt-auth
         project :solr:modules:jwt-auth > project :platform
      > Cannot find a version of 'org.bouncycastle:bcpkix-jdk18on' that satisfies the version constraints:
           Dependency path 'org.apache.solr:jwt-auth:10.0.0-SNAPSHOT' --> 'org.bouncycastle:bcpkix-jdk18on:1.80'
           Constraint path 'org.apache.solr:jwt-auth:10.0.0-SNAPSHOT' --> 'org.bouncycastle:bcpkix-jdk18on:{strictly 1.78.1}' because of the following reason: dependency was locked to version '1.78.1'
           Constraint path 'org.apache.solr:jwt-auth:10.0.0-SNAPSHOT' --> 'org.apache:platform:10.0.0-SNAPSHOT' (runtimeElements) --> 'org.bouncycastle:bcpkix-jdk18on:1.80'

   > Could not resolve org.bouncycastle:bcprov-jdk18on:1.80.
     Required by:
         project :solr:modules:jwt-auth
         project :solr:modules:jwt-auth > project :platform
      > Cannot find a version of 'org.bouncycastle:bcprov-jdk18on' that satisfies the version constraints:
           Dependency path 'org.apache.solr:jwt-auth:10.0.0-SNAPSHOT' --> 'org.bouncycastle:bcprov-jdk18on:1.80'
           Constraint path 'org.apache.solr:jwt-auth:10.0.0-SNAPSHOT' --> 'org.bouncycastle:bcprov-jdk18on:{strictly 1.78.1}' because of the following reason: dependency was locked to version '1.78.1'
           Constraint path 'org.apache.solr:jwt-auth:10.0.0-SNAPSHOT' --> 'org.apache:platform:10.0.0-SNAPSHOT' (runtimeElements) --> 'org.bouncycastle:bcprov-jdk18on:1.80'
           Dependency path 'org.apache.solr:jwt-auth:10.0.0-SNAPSHOT' --> 'org.bouncycastle:bcpkix-jdk18on:1.80' (runtime) --> 'org.bouncycastle:bcutil-jdk18on:1.78.1' (runtime) --> 'org.bouncycastle:bcprov-jdk18on:1.78.1'

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