Update blackfire/php-sdk requirement from ^1.14 to ^1.31

Updates the requirements on blackfire/php-sdk to permit the latest version.

---
updated-dependencies:
- dependency-name: blackfire/php-sdk
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

composer.json

@@ -75,7 +75,7 @@
         "ext-curl": "*",
         "ext-gmp": "*",
         "bjeavons/zxcvbn-php": "^1.0",
-        "blackfire/php-sdk": "^1.14",
+        "blackfire/php-sdk": "^1.31",
         "ekino/phpstan-banned-code": "^1.0",
         "infection/infection": "^0.26",
         "matthiasnoback/symfony-config-test": "^3.1|^4.0",