chore(main): release 1.56.0 (#1227)

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

Author: release-please[bot]

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-    ".": "1.55.2"
+    ".": "1.56.0"
 }

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## [1.56.0](https://github.com/googleapis/api-linter/compare/v1.55.2...v1.56.0) (2023-08-11)
+
+
+### Features
+
+* **AIP-121:** enforce list requirement ([#1225](https://github.com/googleapis/api-linter/issues/1225)) ([7ad11d0](https://github.com/googleapis/api-linter/commit/7ad11d0add4228236bae63f8b3e87812428758e8))
+* **AIP-156:** allow singleton list ([#1230](https://github.com/googleapis/api-linter/issues/1230)) ([ccb38cf](https://github.com/googleapis/api-linter/commit/ccb38cfed985c24dad9055704103583a2d8ff326))
+
 ## [1.55.2](https://github.com/googleapis/api-linter/compare/v1.55.1...v1.55.2) (2023-08-02)
 
 

internal/version.go

@@ -14,4 +14,4 @@
 package internal
 
 // Version is the current tagged release of the library.
-const Version = "1.55.2"
+const Version = "1.56.0"