Update to Tycho 4.0.0-SNAPSHOT

We need to update to Tycho in order to force PGP signing of the
bouncycastle libraries which isn't supported by earlier Tycho versions.
For that we need to run Maven on Java 17 or higher.

In order to run tests on Java 11 add a `toolchain.xml` file into the
`~/.m2` directory providing the path to Java installations:

<?xml version='1.0' encoding='UTF-8'?>
<toolchains>
  <toolchain>
    <type>jdk</type>
    <provides>
      <id>JavaSE-11</id>
      <version>11</version>
    </provides>
    <configuration>
      <jdkHome>/path/to/java-11</jdkHome>
    </configuration>
  </toolchain>
  <toolchain>
    <type>jdk</type>
    <provides>
      <id>JavaSE-17</id>
      <version>17</version>
    </provides>
    <configuration>
      <jdkHome>/path/to/java-17</jdkHome>
    </configuration>
  </toolchain>
</toolchains>

Change-Id: Ib0f18147826e5b4a7fa1f41590772516269de702

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