chore(build/registry): updated go deps.

[FedeDP]

What type of PR is this?

/kind cleanup

Any specific area of the project related to this PR?

/area registry

What this PR does / why we need it:

Updated go deps and ran go mod tidy.
Also, golang for build/registry was bumped to 1.21.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

[FedeDP]

Part of the effort around: falcosecurity/evolution#305

[FedeDP]

Registry build is broken now :/

make
# github.com/falcosecurity/plugin-sdk-go/pkg/loader
In file included from plugin_loader.c:26:
../../../../go/pkg/mod/github.com/falcosecurity/[email protected]/pkg/sdk/strlcpy.h:30:22: error: static declaration of ‘strlcpy’ follows non-static declaration
   30 | static inline size_t strlcpy(char *dst, const char *src, size_t size) {
      |                      ^~~~~~~
In file included from ../../../../go/pkg/mod/github.com/falcosecurity/[email protected]/pkg/sdk/strlcpy.h:22:
/usr/include/string.h:506:15: note: previous declaration of ‘strlcpy’ with type ‘size_t(char * restrict,  const char * restrict,  size_t)’ {aka ‘long unsigned int(char * restrict,  const char * restrict,  long unsigned int)’}
  506 | extern size_t strlcpy (char *__restrict __dest,
      |               ^~~~~~~
make: *** [Makefile:25: registry] Error 1

[leogr]

Thank you!

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: FedeDP, leogr

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• OWNERS [leogr]

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[leogr]

Registry build is broken now :/

make
# github.com/falcosecurity/plugin-sdk-go/pkg/loader
In file included from plugin_loader.c:26:
../../../../go/pkg/mod/github.com/falcosecurity/[email protected]/pkg/sdk/strlcpy.h:30:22: error: static declaration of ‘strlcpy’ follows non-static declaration
   30 | static inline size_t strlcpy(char *dst, const char *src, size_t size) {
      |                      ^~~~~~~
In file included from ../../../../go/pkg/mod/github.com/falcosecurity/[email protected]/pkg/sdk/strlcpy.h:22:
/usr/include/string.h:506:15: note: previous declaration of ‘strlcpy’ with type ‘size_t(char * restrict,  const char * restrict,  size_t)’ {aka ‘long unsigned int(char * restrict,  const char * restrict,  long unsigned int)’}
  506 | extern size_t strlcpy (char *__restrict __dest,
      |               ^~~~~~~
make: *** [Makefile:25: registry] Error 1

AFAIK, @jasondellaluce is working on it, right? see #323