fix(deps): update dependency org.mnode.ical4j:ical4j to v4

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -41,7 +41,7 @@ flexboxVersion = "3.0.0"
 fragmentKtxVersion = "1.8.9"
 glide = "5.0.5"
 gsonVersion = "2.13.2"
-ical4jVersion = "3.2.19"
+ical4jVersion = "4.2.1"
 jackrabbitWebdavVersion = "2.13.5"
 jacoco = "0.8.14"
 jsonVersion = "20250517"

gradle/verification-metadata.xml

@@ -18,7 +18,9 @@
          <trust file=".*-sources[.]jar" regex="true" reason="Android Studio downloads source jars but doesn't add checksums - fixes building in AS"/>
       </trusted-artifacts>
       <ignored-keys>
+         <ignored-key id="16968D251E760606" reason="Key couldn't be downloaded from any key server"/>
          <ignored-key id="340B090F727518D8" reason="Key couldn't be downloaded from any key server"/>
+         <ignored-key id="72385FF0AF338D52" reason="Key couldn't be downloaded from any key server"/>
          <ignored-key id="AE094C852B4EE5DC" reason="Key couldn't be downloaded from any key server"/>
       </ignored-keys>
       <trusted-keys>
@@ -32905,6 +32907,14 @@
             <sha256 value="ea23365abca70f90613ed7ed452ceaea3c48831181bfa0c18b21f2aa63659e76" origin="Generated by Gradle"/>
          </artifact>
       </component>
+      <component group="org.mnode.ical4j" name="ical4j" version="4.2.1">
+         <artifact name="ical4j-4.2.1.jar">
+            <sha256 value="fe90cc259c2cea1d662df2a001b037daea9636cf56697e0db63fe2eddf833914" origin="Generated by Gradle" reason="A key couldn't be downloaded"/>
+         </artifact>
+         <artifact name="ical4j-4.2.1.module">
+            <sha256 value="78c9e9a44b1b4ddf6a51edba979fcb09819709a65565bb36a9407e99414f1ca7" origin="Generated by Gradle" reason="A key couldn't be downloaded"/>
+         </artifact>
+      </component>
       <component group="org.mockito" name="mockito-android" version="4.11.0">
          <artifact name="mockito-android-4.11.0.jar">
             <sha256 value="c631906a7909199f47c4e0d68137bd37a909d2577f06548fe2642b7189cf6358" origin="Generated by Gradle"/>
@@ -33639,6 +33649,14 @@
             <sha256 value="0fe31326e83b7622cbcd9c75d467b291f01ffe3cc6e3e76651ac05a1c1c7a360" origin="Generated by Gradle"/>
          </artifact>
       </component>
+      <component group="org.threeten" name="threeten-extra" version="1.8.0">
+         <artifact name="threeten-extra-1.8.0.jar">
+            <sha256 value="51e4d21edc4e9447f7760c050e0baee75d7d973f387ba605a17abdc4d24fd6d8" origin="Generated by Gradle" reason="A key couldn't be downloaded"/>
+         </artifact>
+         <artifact name="threeten-extra-1.8.0.pom">
+            <sha256 value="a5d8cdf2592bda1ef405965883db2da431b267c76de300d075821e20f6dc0c7d" origin="Generated by Gradle" reason="A key couldn't be downloaded"/>
+         </artifact>
+      </component>
       <component group="org.tukaani" name="xz" version="1.9">
          <artifact name="xz-1.9.jar">
             <sha256 value="211b306cfc44f8f96df3a0a3ddaf75ba8c5289eed77d60d72f889bb855f535e5" origin="Generated by Gradle"/>