Update module spf13/viper to v1.6.2 (#272)

Update module spf13/viper to v1.6.2

Reviewed-on: https://kolaente.dev/vikunja/api/pulls/272

vendor/github.com/spf13/viper/.golangci.yml

@@ -0,0 +1,24 @@
+linters-settings:
+    golint:
+        min-confidence: 0.1
+    goimports:
+        local-prefixes: github.com/spf13/viper
+
+linters:
+    enable-all: true
+    disable:
+        - funlen
+        - maligned
+
+        # TODO: fix me
+        - wsl
+        - gochecknoinits
+        - gosimple
+        - gochecknoglobals
+        - errcheck
+        - lll
+        - godox
+        - scopelint
+        - gocyclo
+        - gocognit
+        - gocritic