Bump sqlparse from 0.4.1 to 0.4.2 in /backend

Bumps [sqlparse](https://github.com/andialbrecht/sqlparse) from 0.4.1 to 0.4.2.
- [Release notes](https://github.com/andialbrecht/sqlparse/releases)
- [Changelog](https://github.com/andialbrecht/sqlparse/blob/master/CHANGELOG)
- [Commits](https://github.com/andialbrecht/sqlparse/compare/0.4.1...0.4.2)

---
updated-dependencies:
- dependency-name: sqlparse
  dependency-type: indirect
...

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

backend/poetry.lock

@@ -537,7 +537,7 @@ saml = ["python3-saml (>=1.2.1)"]
 
 [[package]]
 name = "sqlparse"
-version = "0.4.1"
+version = "0.4.2"
 description = "A non-validating SQL parser."
 category = "main"
 optional = false
@@ -890,8 +890,8 @@ social-auth-core = [
     {file = "social_auth_core-4.1.0-py3-none-any.whl", hash = "sha256:983b53167ac56e7ba4909db555602a6e7a98c97ca47183bb222eb85ba627bf2b"},
 ]
 sqlparse = [
-    {file = "sqlparse-0.4.1-py3-none-any.whl", hash = "sha256:017cde379adbd6a1f15a61873f43e8274179378e95ef3fede90b5aa64d304ed0"},
-    {file = "sqlparse-0.4.1.tar.gz", hash = "sha256:0f91fd2e829c44362cbcfab3e9ae12e22badaa8a29ad5ff599f9ec109f0454e8"},
+    {file = "sqlparse-0.4.2-py3-none-any.whl", hash = "sha256:48719e356bb8b42991bdbb1e8b83223757b93789c00910a616a071910ca4a64d"},
+    {file = "sqlparse-0.4.2.tar.gz", hash = "sha256:0c00730c74263a94e5a9919ade150dfc3b19c574389985446148402998287dae"},
 ]
 twisted = [
     {file = "Twisted-20.3.0-cp27-cp27m-macosx_10_6_intel.whl", hash = "sha256:cdbc4c7f0cd7a2218b575844e970f05a1be1861c607b0e048c9bceca0c4d42f7"},