App Broker 2.0.x

Major dependencies updates:
* Spring Boot 3
* Spring Framework 6
* Spring Cloud Open Service Broker 4.0.0-SNAPSHOT
* Java 17
* Gradle 7.6

Dockerfile:
* Update to Ubuntu Jammy
* Bump to OpenJDK 17
* Remove usage of deprecated `apt-key` tool
* Bump all other tools to latest versions (bosh, bbl, credhub etc.)

ATs:
* Pass required java buildpack env var to use Java 17 on CF
* Update `cf login` invocation to work with cf-cli v8

Small improvements:
* Reliable datetime comparison in `InMemoryServiceInstanceStateRepositoryTest`
* Update `.editorconfig` to match existing style
* Add `.sdkmanrc`

.github/workflows/gradle-build.yml

@@ -1,30 +1,28 @@
 # This workflow will build a Java project with Gradle
 # For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
 
-name: build
+name: Gradle build
 
 on:
-  push:
-    branches: [ main, 1.3.x, 1.2.x, 1.1.x ]
-  pull_request:
-    branches: [ main, 1.3.x, 1.2.x, 1.1.x ]
+  workflow_call:
+    inputs:
+      java-version:
+        required: true
+        type: string
 
 jobs:
   build:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        java: [ '8', '11' ]
-    name: Java ${{ matrix.Java }} build
+    name: Java ${{ inputs.java-version }} build
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Set up JDK
-        uses: actions/setup-java@v2
+        uses: actions/setup-java@v3
         with:
-          java-version: ${{ matrix.java }}
-          distribution: adopt
+          java-version: ${{ inputs.java-version }}
+          distribution: temurin
       - name: Cache Gradle packages
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: |
             ~/.gradle/caches

.github/workflows/java-17-baseline.yml

@@ -0,0 +1,16 @@
+name: Java 17 baseline build
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        java: [ '17' ]
+    uses: ./.github/workflows/gradle-build.yml
+    with:
+      java-version: ${{ matrix.java }}

.github/workflows/java-8-baseline.yml

@@ -0,0 +1,16 @@
+name: Java 8 baseline build
+
+on:
+  push:
+    branches: [ 1.6.x, 1.5.x, 1.4.x ]
+  pull_request:
+    branches: [ 1.6.x, 1.5.x, 1.4.x ]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        java: [ '8', '11', '17' ]
+    uses: ./.github/workflows/gradle-build.yml
+    with:
+      java-version: ${{ matrix.java }}