chore: force okio version and upgrade okhttp3 to latest stable release

[dfederschmidt]

The following PR upgrades okhttp3 to the latest available stable version. Due to a CVE released for the transitive dependency okio. Unfortunately, no stable version of okhttp3 exists that we can upgrade to.

This PR excludes okio from the dependency resolution of okhttp3 and adds it as a direct dependency instead.

According to square/okhttp#7944 this is the recommendation by the maintainers. There is no timeline for a 4.12.x release to mitigate this yet.

This is what the updated depdendency tree looks like

[INFO] --- dependency:3.6.0:tree (default-cli) @ splunk-library-javalogging ---
[INFO] com.splunk.logging:splunk-library-javalogging:jar:1.11.7
[INFO] +- junit:junit:jar:4.13.2:test
[INFO] |  \- org.hamcrest:hamcrest-core:jar:1.3:test
[INFO] +- org.slf4j:slf4j-api:jar:1.7.36:test (scope not updated to provided)
[INFO] +- ch.qos.logback:logback-classic:jar:1.2.11:provided
[INFO] |  +- (ch.qos.logback:logback-core:jar:1.2.11:provided - omitted for duplicate)
[INFO] |  \- (org.slf4j:slf4j-api:jar:1.7.32:provided - omitted for conflict with 1.7.36)
[INFO] +- ch.qos.logback:logback-core:jar:1.2.11:provided (scope not updated to provided)
[INFO] +- ch.qos.logback:logback-access:jar:1.2.11:provided
[INFO] |  \- (ch.qos.logback:logback-core:jar:1.2.11:provided - omitted for duplicate)
[INFO] +- com.squareup.okhttp3:okhttp:jar:4.11.0:compile
[INFO] |  +- org.jetbrains.kotlin:kotlin-stdlib:jar:1.6.20:compile
[INFO] |  |  +- org.jetbrains.kotlin:kotlin-stdlib-common:jar:1.6.20:compile
[INFO] |  |  \- org.jetbrains:annotations:jar:13.0:compile
[INFO] |  \- org.jetbrains.kotlin:kotlin-stdlib-jdk8:jar:1.6.20:compile
[INFO] |     +- (org.jetbrains.kotlin:kotlin-stdlib:jar:1.6.20:compile - omitted for duplicate)
[INFO] |     \- org.jetbrains.kotlin:kotlin-stdlib-jdk7:jar:1.6.20:compile
[INFO] |        \- (org.jetbrains.kotlin:kotlin-stdlib:jar:1.6.20:compile - omitted for duplicate)
[INFO] +- com.squareup.okio:okio:jar:3.5.0:compile
[INFO] |  \- com.squareup.okio:okio-jvm:jar:3.5.0:compile
[INFO] |     +- (org.jetbrains.kotlin:kotlin-stdlib-jdk8:jar:1.9.0:compile - omitted for conflict with 1.6.20)
[INFO] |     \- (org.jetbrains.kotlin:kotlin-stdlib-common:jar:1.9.0:compile - omitted for conflict with 1.6.20)
[INFO] +- org.apache.logging.log4j:log4j-api:jar:2.17.2:provided
[INFO] +- org.apache.logging.log4j:log4j-core:jar:2.17.2:provided
[INFO] |  \- (org.apache.logging.log4j:log4j-api:jar:2.17.2:provided - omitted for duplicate)
[INFO] +- com.splunk:splunk:jar:1.6.5.0:test
[INFO] +- com.google.code.gson:gson:jar:2.9.0:compile
[INFO] \- org.apache.commons:commons-lang3:jar:3.12.0:test