feat: add 'kpm update' to update the dependencies

[zong-zhe]

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• N
• Y

FIxed #5 and #200

2. What is the scope of this PR (e.g. component or file name):

pkg/cmd/cmd_update.go

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Other

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• N
• Y

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• Unit test
• Integration test
• Benchmark (add benchmark stats below)
• Manual test (add detailed scripts or steps below)
• Other

[coveralls]

Pull Request Test Coverage Report for Build 6860696820

• 28 of 147 (19.05%) changed or added relevant lines in 7 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.7%) to 36.395%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/utils/utils.go	2	4	50.0%
pkg/package/package.go	0	3	0.0%
pkg/cmd/cmd_push.go	0	4	0.0%
pkg/oci/oci.go	0	7	0.0%
pkg/cmd/cmd_update.go	0	43	0.0%
pkg/client/client.go	24	84	28.57%

Totals
Change from base Build 6717972137:	-0.7%
Covered Lines:	1272
Relevant Lines:	3495

---

💛 - Coveralls

[Peefy]

LGTM