chore: update documentation for jib-core 0.26.0 and plugins 3.4.1 releases

[mpeddada1]

Updating documentations for:

• jib-core: 0.26.0
• jib-maven-plugin:3.4.1
• jib-gradle-plugin:3.4.1

[mpeddada1]

Test failure for kokoro-ubuntu due to:

com.google.cloud.tools.jib.registry.BlobPullerIntegrationTest > testPull FAILED
    java.net.SocketException: Connection reset
        at java.base/java.net.SocketInputStream.read([SocketInputStream.java:186](https://cs.corp.google.com/#search/&sq=package:%5Epiper$%20project:openjdk21&q=java/net/SocketInputStream.java:186))
        at java.base/java.net.SocketInputStream.read([SocketInputStream.java:140](https://cs.corp.google.com/#search/&sq=package:%5Epiper$%20project:openjdk21&q=java/net/SocketInputStream.java:140))
        at java.base/sun.security.ssl.SSLSocketInputRecord.read([SSLSocketInputRecord.java:484](https://cs.corp.google.com/#search/&sq=package:%5Epiper$%20project:openjdk21&q=sun/security/ssl/SSLSocketInputRecord.java:484))
        at java.base/sun.security.ssl.SSLSocketInputRecord.readFully([SSLSocketInputRecord.java:467](https://cs.corp.google.com/#search/&sq=package:%5Epiper$%20project:openjdk21&q=sun/security/ssl/SSLSocketInputRecord.java:467))
        at java.base/sun.security.ssl.SSLSocketInputRecord.decodeInputRecord([SSLSocketInputRecord.java:243](https://cs.corp.google.com/#search/&sq=package:%5Epiper$%20project:openjdk21&q=sun/security/ssl/SSLSocketInputRecord.java:243))

Will re-run the job

[mpeddada1]

Thanks @blakeli0!