chore: regenerate Java SDK from latest OpenAPI spec (#39)

* chore: regenerate Java SDK from latest Rootly OpenAPI spec

Regenerated using openapi-generator v7.13.0 against the latest
Rootly swagger.json. Strips Object.validateJsonElement calls
from generated sources.

* ci: pin GitHub Actions to full-length commit SHAs

Pin actions/checkout and actions/setup-java to commit SHAs
to comply with rootlyhq org policy requiring pinned actions.

* fix: upgrade jackson-databind-nullable 0.2.6 → 0.2.10

0.2.6 transitively pulls jackson-core:2.14.0-rc2 which is no
longer available on Maven Central, breaking CI builds.

* fix: strip UUID.validateJsonElement calls from generated sources

Post-generation sed only removed Object.validateJsonElement but
UUID.validateJsonElement also has no such method, causing compile
errors in GetTeamIdParameter and GetAlertFieldIdParameter.

* chore: update Makefile sed to also strip UUID.validateJsonElement

* fix: regenerate test stubs to match current API signatures

Old test stubs had stale method signatures (String vs
GetAlertFieldIdParameter, missing params, etc). Deleted and
regenerated all test files. Re-applied SHA-pinned actions,
jackson-databind-nullable 0.2.10, and validateJsonElement
stripping.

* chore: delete stale test stubs before regeneration in Makefile

Author: kwent

.github/workflows/maven.yml

@@ -19,9 +19,9 @@ jobs:
       matrix:
         java: [ 17, 21 ]
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
     - name: Set up JDK
-      uses: actions/setup-java@v4
+      uses: actions/setup-java@c1e323688fd81a25caa38c78aa6df2d33d3e20d9 # v4
       with:
         java-version: ${{ matrix.java }}
         distribution: 'temurin'

.github/workflows/publish.yml

@@ -9,9 +9,9 @@ jobs:
   test-and-publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
       - name: Set up JDK
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@c1e323688fd81a25caa38c78aa6df2d33d3e20d9 # v4
         with:
           java-version: '17'
           distribution: 'temurin'

.github/workflows/test.yml

@@ -9,9 +9,9 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
       - name: Set up JDK
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@c1e323688fd81a25caa38c78aa6df2d33d3e20d9 # v4
         with:
           java-version: '17'
           distribution: 'temurin'