Tweak lint rules

Gofumpt is too strict for my tastes.

.golangci.yaml

@@ -29,6 +29,14 @@ linters-settings:
     allow-unused: false # report any unused nolint directives
     require-explanation: false # don't require an explanation for nolint directives
     require-specific: false # don't require nolint directives to be specific about which linter is being skipped
+  paralleltest:
+    # Ignore missing calls to `t.Parallel()` and only report incorrect uses of it.
+    # Default: false
+    ignore-missing: false
+    # Ignore missing calls to `t.Parallel()` in subtests. Top-level tests are
+    # still required to have `t.Parallel`, but subtests are allowed to skip it.
+    # Default: false
+    ignore-missing-subtests: false
 
 linters:
   disable-all: true
@@ -44,7 +52,7 @@ linters:
 #    - forcetypeassert
     - gochecknoinits
     - gocritic
-    - gofumpt
+#    - gofumpt
     - goimports
     - goprintffuncname
     - gosimple