Bump micronaut-servlet-core from 1.0.2 to 2.0.0 (#261)

Bumps [micronaut-servlet-core](https://github.com/micronaut-projects/micronaut-servlet) from 1.0.2 to 2.0.0.
- [Release notes](https://github.com/micronaut-projects/micronaut-servlet/releases)
- [Commits](micronaut-projects/micronaut-servlet@v1.0.2...v2.0.0)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

gcp-function-http-test/build.gradle

@@ -4,7 +4,7 @@ dependencies {
     api "io.micronaut:micronaut-http-server:$micronautVersion"
     api 'com.google.cloud.functions:functions-framework-api:1.0.2'
     api project(":gcp-function-http")
-    implementation "io.micronaut.servlet:micronaut-servlet-core:1.0.2"
+    implementation "io.micronaut.servlet:micronaut-servlet-core:2.0.0"
     implementation 'org.eclipse.jetty:jetty-servlet:9.4.31.v20200723'
     testImplementation "io.micronaut:micronaut-inject-groovy"
     testImplementation "io.micronaut.test:micronaut-test-spock:2.1.0"

gcp-function-http/build.gradle

@@ -5,7 +5,7 @@ dependencies {
     api project(":gcp-function")
     implementation "io.micronaut:micronaut-http-netty:$micronautVersion"
     implementation "io.micronaut:micronaut-http-server:$micronautVersion"
-    implementation "io.micronaut.servlet:micronaut-servlet-core:1.0.2"
+    implementation "io.micronaut.servlet:micronaut-servlet-core:2.0.0"
     implementation "io.micronaut:micronaut-router:$micronautVersion"
     compileOnly 'com.google.cloud.functions:functions-framework-api:1.0.2'