Setup Renovate as replacement for Dependabot

This will set up renovate in a fairly opinionated way:

 * auto-upgrades
 * widening PHP version support, when tests pass
 * nightly composer.lock upgrades
 * narrowing dependency ranges regularly

Signed-off-by: Luís Cobucci <lcobucci@gmail.com>

Author: renovate[bot]

.gitattributes

@@ -6,3 +6,4 @@
 /README.md      export-ignore
 /composer.lock  export-ignore
 /Makefile       export-ignore
+/renovate.json  export-ignore

.github/dependabot.yml

@@ -3,5 +3,5 @@
 /phpcs.xml
 /.phpcs.cache
 /infection.log
-/.phpunit.result.cache
+/.phpunit.cache
 /build

.github/workflows/merge-bot.yml

@@ -12,21 +12,21 @@ vendor/composer/installed.json: composer.json composer.lock
 
 .PHONY: phpunit
 phpunit:
-	@vendor/bin/phpunit
+	@php -d zend.assertions=1 vendor/bin/phpunit $(PHPUNIT_FLAGS)
 
 .PHONY: infection
 infection:
-	@vendor/bin/phpunit --coverage-xml=build/coverage-xml --log-junit=build/junit.xml $(PHPUNIT_FLAGS)
+	@XDEBUG_MODE=coverage vendor/bin/phpunit --coverage-xml=build/coverage-xml --log-junit=build/junit.xml $(PHPUNIT_FLAGS)
 	@vendor/bin/infection -s --threads=$(PARALLELISM) --coverage=build $(INFECTION_FLAGS)
 
 .PHONY: phpcbf
 phpcbf:
-	@vendor/bin/phpcbf --parallel=$(PARALLELISM)
+	@vendor/bin/phpcbf --parallel=$(PARALLELISM) || true
 
 .PHONY: phpcs
 phpcs:
 	@vendor/bin/phpcs --parallel=$(PARALLELISM) $(PHPCS_FLAGS)
 
 .PHONY: phpstan
 phpstan:
-	@vendor/bin/phpstan analyse
+	@XDEBUG_MODE=off vendor/bin/phpstan analyse

.gitignore

@@ -10,18 +10,18 @@
         }
     ],
     "require": {
-        "php": "^7.4 || ^8.0",
-        "doctrine/annotations": "^1.12"
+        "php": "~8.1.0 || ~8.2.0",
+        "doctrine/annotations": "^2.0"
     },
     "require-dev": {
-        "infection/infection": "^0.21",
-        "lcobucci/coding-standard": "^6.0",
-        "phpstan/extension-installer": "^1.1",
-        "phpstan/phpstan": "^0.12",
-        "phpstan/phpstan-deprecation-rules": "^0.12",
-        "phpstan/phpstan-phpunit": "^0.12",
-        "phpstan/phpstan-strict-rules": "^0.12",
-        "phpunit/phpunit": "^9.5"
+        "infection/infection": "^0.26",
+        "lcobucci/coding-standard": "^9.0",
+        "phpstan/extension-installer": "^1.2",
+        "phpstan/phpstan": "^1.10",
+        "phpstan/phpstan-deprecation-rules": "^1.1",
+        "phpstan/phpstan-phpunit": "^1.3",
+        "phpstan/phpstan-strict-rules": "1.5",
+        "phpunit/phpunit": "^10.0"
     },
     "autoload": {
         "psr-4": {