Upgrade fmt-maven-plugin 2.12 -> 2.18 (#75)

This also upgrades Google Java Format 1.11.0 -> 1.15.0, improving support for 
Java 17 syntax, among other things.

See:
- https://github.com/google/google-java-format/releases/tag/v1.12.0
- https://github.com/google/google-java-format/releases/tag/v1.13.0
- https://github.com/google/google-java-format/releases/tag/v1.14.0
- https://github.com/google/google-java-format/releases/tag/v1.15.0
- google/google-java-format@v1.11.0...v1.15.0
- https://github.com/spotify/fmt-maven-plugin/releases/tag/2.13.0
- https://github.com/spotify/fmt-maven-plugin/releases/tag/2.14.0
- https://github.com/spotify/fmt-maven-plugin/releases/tag/2.15.0
- https://github.com/spotify/fmt-maven-plugin/releases/tag/2.16.0
- https://github.com/spotify/fmt-maven-plugin/releases/tag/2.17.0
- https://github.com/spotify/fmt-maven-plugin/releases/tag/2.18.0
- spotify/fmt-maven-plugin@2.12.0...2.18.0

pom.xml

@@ -403,11 +403,6 @@
     <build>
         <pluginManagement>
             <plugins>
-                <plugin>
-                    <groupId>com.coveo</groupId>
-                    <artifactId>fmt-maven-plugin</artifactId>
-                    <version>2.12</version>
-                </plugin>
                 <plugin>
                     <groupId>com.github.ekryd.sortpom</groupId>
                     <artifactId>sortpom-maven-plugin</artifactId>
@@ -435,6 +430,14 @@
                         </execution>
                     </executions>
                 </plugin>
+                <plugin>
+                    <groupId>com.spotify.fmt</groupId>
+                    <artifactId>fmt-maven-plugin</artifactId>
+                    <version>2.18</version>
+                    <configuration>
+                        <forkMode>never</forkMode>
+                    </configuration>
+                </plugin>
                 <plugin>
                     <groupId>de.thetaphi</groupId>
                     <artifactId>forbiddenapis</artifactId>
@@ -1272,7 +1275,11 @@
             <build>
                 <plugins>
                     <plugin>
-                        <groupId>com.coveo</groupId>
+                        <groupId>com.github.ekryd.sortpom</groupId>
+                        <artifactId>sortpom-maven-plugin</artifactId>
+                    </plugin>
+                    <plugin>
+                        <groupId>com.spotify.fmt</groupId>
                         <artifactId>fmt-maven-plugin</artifactId>
                         <executions>
                             <execution>
@@ -1283,10 +1290,6 @@
                             </execution>
                         </executions>
                     </plugin>
-                    <plugin>
-                        <groupId>com.github.ekryd.sortpom</groupId>
-                        <artifactId>sortpom-maven-plugin</artifactId>
-                    </plugin>
                     <plugin>
                         <groupId>de.thetaphi</groupId>
                         <artifactId>forbiddenapis</artifactId>
@@ -1607,7 +1610,7 @@
                 <pluginManagement>
                     <plugins>
                         <plugin>
-                            <groupId>com.coveo</groupId>
+                            <groupId>com.spotify.fmt</groupId>
                             <artifactId>fmt-maven-plugin</artifactId>
                             <configuration>
                                 <skip>true</skip>