chore(v2): remove java 1.8 relics from the code

[jeromevdl]

Issue #, if available: #1523

Description of changes:

Remove the latest references to java 1.8 (pom, docs, e2e tests...)

Checklist

• Meet tenets criteria
• Update tests
• Update docs
• PR title follows conventional commit semantics

Breaking change checklist

RFC issue #: #1523

• Migration process documented
• Implement warnings (if it can live side by side)

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[github-actions]

💾 Artifacts Size Report

Module	Version	Size (KB)
powertools-common	2.0.0-SNAPSHOT	9.59
powertools-serialization	2.0.0-SNAPSHOT	17.23
powertools-logging	2.0.0-SNAPSHOT	33.07
powertools-logging-log4j	2.0.0-SNAPSHOT	20.68
powertools-logging-logback	2.0.0-SNAPSHOT	16.91
powertools-tracing	2.0.0-SNAPSHOT	14.01
powertools-metrics	2.0.0-SNAPSHOT	14.05
powertools-parameters	2.0.0-SNAPSHOT	17.49
powertools-validation	2.0.0-SNAPSHOT	19.94
powertools-cloudformation	2.0.0-SNAPSHOT	16.58
powertools-idempotency-core	2.0.0-SNAPSHOT	34.63
powertools-idempotency-dynamodb	2.0.0-SNAPSHOT	12.37
powertools-large-messages	2.0.0-SNAPSHOT	17.45
powertools-batch	2.0.0-SNAPSHOT	16.89
powertools-parameters-ssm	2.0.0-SNAPSHOT	10.70
powertools-parameters-secrets	2.0.0-SNAPSHOT	9.90
powertools-parameters-dynamodb	2.0.0-SNAPSHOT	11.95
powertools-parameters-appconfig	2.0.0-SNAPSHOT	11.45

[scottgerring]

It's nice to see this getting cut out @jeromevdl :D
Couple of other bits I found:

There's a bunch of java 1.8 refs in the metrics docs still, starting here:

powertools-lambda-java/docs/core/metrics.md

Line 31 in 7190546

Depending on your version of Java (either Java 1.8 or 11+), the configuration slightly changes.

as well as large_messages.md and validation.md

build.gradle.kts for the kotlin example appears to depend on a java1.8 specific bit org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.10.

[jeromevdl]

It's nice to see this getting cut out @jeromevdl :D Couple of other bits I found:

There's a bunch of java 1.8 refs in the metrics docs still, starting here:

powertools-lambda-java/docs/core/metrics.md

Line 31 in 7190546

Depending on your version of Java (either Java 1.8 or 11+), the configuration slightly changes.

as well as large_messages.md and validation.md

build.gradle.kts for the kotlin example appears to depend on a java1.8 specific bit org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.10.

• metrics was done in the metrics v4 PR
• validation is done in the batch validation PR
• I missed the other 2

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[scottgerring]

LGTM! 💀 java8