Update master for 1.5.0 release (#2455)

* Enable CI for 1.5.x branch
* Enable Mergify for 1.5.x branch
* Drop 1.2.x from Mergify

.github/configs/mergify_config.yml

@@ -2,6 +2,6 @@
 conditions:
   - status-success=all tests passed
 branches:
-  - 1.2.x
   - 1.3.x
   - 1.4.x
+  - 1.5.x

.github/workflows/test.yml

@@ -5,6 +5,7 @@ on:
   push:
     branches:
       - master
+      - 1.5.x
       - 1.4.x
       - 1.3.x
       - 1.2.x

.mergify.yml

@@ -17,62 +17,62 @@ pull_request_rules:
       name: default
       method: squash
       update_method: merge
-- name: backport to 1.4.x
+- name: backport to 1.5.x
   conditions:
   - merged
   - base=master
-  - milestone=1.4.x
+  - milestone=1.5.x
   actions:
     backport:
       branches:
-      - 1.4.x
+      - 1.5.x
       labels:
       - Backport
       ignore_conflicts: true
       label_conflicts: bp-conflict
     label:
       add:
       - Backported
-- name: backport to 1.3.x, 1.4.x
+- name: backport to 1.4.x, 1.5.x
   conditions:
   - merged
   - base=master
-  - milestone=1.3.x
+  - milestone=1.4.x
   actions:
     backport:
       branches:
-      - 1.3.x
       - 1.4.x
+      - 1.5.x
       labels:
       - Backport
       ignore_conflicts: true
       label_conflicts: bp-conflict
     label:
       add:
       - Backported
-- name: backport to 1.2.x, 1.3.x, 1.4.x
+- name: backport to 1.3.x, 1.4.x, 1.5.x
   conditions:
   - merged
   - base=master
-  - milestone=1.2.x
+  - milestone=1.3.x
   actions:
     backport:
       branches:
-      - 1.2.x
       - 1.3.x
       - 1.4.x
+      - 1.5.x
       labels:
       - Backport
       ignore_conflicts: true
       label_conflicts: bp-conflict
     label:
       add:
       - Backported
-- name: automatic squash-and-mege of 1.2.x backport PRs
+- name: automatic squash-and-mege of 1.3.x backport PRs
   conditions:
   - status-success=all tests passed
   - '#changes-requested-reviews-by=0'
-  - base=1.2.x
+  - base=1.3.x
   - label="Backport"
   - label!="DO NOT MERGE"
   - label!="bp-conflict"
@@ -81,11 +81,11 @@ pull_request_rules:
       name: default
       method: squash
       update_method: merge
-- name: automatic squash-and-mege of 1.3.x backport PRs
+- name: automatic squash-and-mege of 1.4.x backport PRs
   conditions:
   - status-success=all tests passed
   - '#changes-requested-reviews-by=0'
-  - base=1.3.x
+  - base=1.4.x
   - label="Backport"
   - label!="DO NOT MERGE"
   - label!="bp-conflict"
@@ -94,11 +94,11 @@ pull_request_rules:
       name: default
       method: squash
       update_method: merge
-- name: automatic squash-and-mege of 1.4.x backport PRs
+- name: automatic squash-and-mege of 1.5.x backport PRs
   conditions:
   - status-success=all tests passed
   - '#changes-requested-reviews-by=0'
-  - base=1.4.x
+  - base=1.5.x
   - label="Backport"
   - label!="DO NOT MERGE"
   - label!="bp-conflict"