Bump mysql2 from 0.5.6 to 0.5.7

Bumps [mysql2](https://github.com/brianmario/mysql2) from 0.5.6 to 0.5.7.
- [Release notes](https://github.com/brianmario/mysql2/releases)
- [Commits](brianmario/mysql2@0.5.6...0.5.7)

---
updated-dependencies:
- dependency-name: mysql2
  dependency-version: 0.5.7
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -495,7 +495,8 @@ GEM
       mittsu (~> 0.4)
     msgpack (1.8.0)
     multi_json (1.17.0)
-    mysql2 (0.5.6)
+    mysql2 (0.5.7)
+      bigdecimal
     nanoid (2.0.0)
     nenv (0.3.0)
     net-http (0.6.0)
@@ -1225,7 +1226,7 @@ CHECKSUMS
   mittsu-mesh_analysis (0.1.0) sha256=13550c35e56bcd10cbe8284fe1b3cf3a43f7bb7133f47995e0c8a8b5d2a9cd50
   msgpack (1.8.0) sha256=e64ce0212000d016809f5048b48eb3a65ffb169db22238fb4b72472fecb2d732
   multi_json (1.17.0) sha256=76581f6c96aebf2e85f8a8b9854829e0988f335e8671cd1a56a1036eb75e4a1b
-  mysql2 (0.5.6) sha256=70f447d45d6b3cc16b00f7dd30366f708a81b4093a35d026ff7135d778d8da33
+  mysql2 (0.5.7) sha256=ba09ede515a0ae8a7192040a1b778c0fb0f025fa5877e9be895cd325fa5e9d7b
   nanoid (2.0.0) sha256=78a5c93c1595981fb37712a166d7ea1ef15a679553e5d3c72337f231febd8bfc
   nenv (0.3.0) sha256=d9de6d8fb7072228463bf61843159419c969edb34b3cef51832b516ae7972765
   net-http (0.6.0) sha256=9621b20c137898af9d890556848c93603716cab516dc2c89b01a38b894e259fb