build(deps-dev): bump pytest-cov from 2.11.1 to 2.12.0

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.11.1 to 2.12.0.
- [Release notes](https://github.com/pytest-dev/pytest-cov/releases)
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest-cov/compare/v2.11.1...v2.12.0)

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

Pipfile.lock

@@ -39,10 +39,10 @@
         },
         "attrs": {
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-                "sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700"
+                "sha256:149e90d6d8ac20db7a955ad60cf0e6881a3f20d37096140088356da6c716b0b1",
+                "sha256:ef6aaac3ca6cd92904cdd0d83f629a15f18053ec84e6432106f7a4d04ae4f5fb"
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-            "version": "==20.3.0"
+            "version": "==21.2.0"
         },
         "black": {
             "hashes": [
@@ -61,6 +61,9 @@
             "version": "==7.1.2"
         },
         "coverage": {
+            "extras": [
+                "toml"
+            ],
             "hashes": [
                 "sha256:004d1880bed2d97151facef49f08e255a20ceb6f9432df75f4eef018fdd5a78c",
                 "sha256:01d84219b5cdbfc8122223b39a954820929497a1cb1422824bb86b07b74594b6",
@@ -278,11 +281,11 @@
         },
         "pytest-cov": {
             "hashes": [
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+                "sha256:8535764137fecce504a49c2b742288e3d34bc09eed298ad65963616cc98fd45e",
+                "sha256:95d4933dcbbacfa377bb60b29801daa30d90c33981ab2a79e9ab4452c165066e"
             ],
             "index": "pypi",
-            "version": "==2.11.1"
+            "version": "==2.12.0"
         },
         "regex": {
             "hashes": [
@@ -332,10 +335,10 @@
         },
         "six": {
             "hashes": [
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-                "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"
+                "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926",
+                "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"
             ],
-            "version": "==1.15.0"
+            "version": "==1.16.0"
         },
         "toml": {
             "hashes": [
@@ -346,46 +349,46 @@
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