vendor: bump gopkg.in/yaml.v2 v2.2.8

full diff: go-yaml/yaml@v2.2.3...v2.2.8

includes:

- go-yaml/yaml 515 Improve heuristics preventing CPU/memory abuse
- go-yaml/yaml@f90ceb4 Fix check for non-map alias merging in v2
    - fix for "yaml.Unmarshal crashes on "assignment to entry in nil map""
- go-yaml/yaml 543 Port stale simple_keys fix to v2
- go-yaml/yaml@1f64d61 Fix issue in simple_keys improvements
    - fixes "Invalid simple_keys now cause panics later in decode"
- go-yaml/yaml 555 Optimize cases with long potential simple_keys

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 3dfcfbb2bf947a9e28611334d34741b40ecfd5c7)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 83d4cb900080236c0d7442e008cb3fc77d7ce307
Component: cli

Author: thaJeztah

components/cli/vendor.conf

@@ -89,7 +89,7 @@ golang.org/x/time                                   fbb02b2291d28baffd63558aa44b
 google.golang.org/genproto                          02b4e95473316948020af0b7a4f0f22c73929b0e
 google.golang.org/grpc                              39e8a7b072a67ca2a75f57fa2e0d50995f5b22f6 # v1.23.1
 gopkg.in/inf.v0                                     d2d2541c53f18d2a059457998ce2876cc8e67cbf # v0.9.1
-gopkg.in/yaml.v2                                    bb4e33bf68bf89cad44d386192cbed201f35b241 # v2.2.3
+gopkg.in/yaml.v2                                    53403b58ad1b561927d19068c655246f2db79d48 # v2.2.8
 gotest.tools/v3                                     ab4a870b92ce57a83881fbeb535a137a20d664b7 # v3.0.1
 k8s.io/api                                          40a48860b5abbba9aa891b02b32da429b08d96a0 # kubernetes-1.14.0
 k8s.io/apimachinery                                 d7deff9243b165ee192f5551710ea4285dcfd615 # kubernetes-1.14.0