Update 'google-java-format' 1.7 -> 1.9

[Ziga Gregoric]

What steps will reproduce the problem?
Steps to reproduce the behavior:

1. mvn git-code-format:format-code; git add . ; git commit -m"Apply code format"
2. mvn spotless:apply // to test reformat

What is the expected output?
No changes.

$ git status
> ... nothing to commit, working tree clean

What happens instead?
Code got reformatted.

$ git status
> ... modified: Foo.java

Environment:

• OS: macOS 11.0.1
• Git version: 2.28.0
• git-code-format-maven-plugin version: 2.7
• Maven version: 3.6.3
• Java version: 11

Here's plugins configuration:

<project>
<build>
<plugins>
...
<plugin>
  <groupId>com.cosium.code</groupId>
  <artifactId>git-code-format-maven-plugin</artifactId>
  <version>2.7</version>
</plugin>
<plugin>
  <groupId>com.diffplug.spotless</groupId>
  <artifactId>spotless-maven-plugin</artifactId>
  <version>2.6.0</version>
  <configuration>
    <java>
      <googleJavaFormat/>
    </java>
  </configuration>
</plugin>
...

Link to a git repository that can be cloned to reproduce the problem:
Private repository, but if I'll manage to replicate it on a public repo, I'll add it in here.

Additional context
Being up to date with latest google-java-format version, saves clarifications when google-java-format IDE plugins or other formatting plugins 'change' formatting.

There is a formatting change around stram() which changed in google-java-format 1.8.

    // google-java-format 1.7
    xxx xxx =
        xxx.xxx().xxx().xxx()
            .stream()
            .xxx()
            .xxx();

    // google-java-format 1.8 and 1.9
    xxx xxx =
        xxx
            .xxx()
            .xxx()
            .xxx()
            .stream()
            .xxx()
            .xxx();

For a test, I've upgraded google-java-format version (https://github.com/Cosium/git-code-format-maven-plugin/blob/master/pom.xml#L43) to 1.8 and 1.9 and reformatted with snapshot build of git-code-format-maven-plugin and got same format as with the other plugin (spotless uses 1.9).

Note that google-java-format requires JDK 11 at runtime.