chore: bump artifact version to v0.7.0-alpha.2

[Peefy]

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

• N
• Y

chore: bump artifact version to v0.7.0-alpha.2

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

• go.mod
• pkg/spec/gpyrpc/gpyrpc.pb.go
• pkg/spec/gpyrpc/gpyrpc.proto

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 6848534666

• 0 of 28 (0.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.5%) to 65.186%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/service/grpc_server.go	0	6	0.0%
pkg/service/rest_server.go	0	10	0.0%
pkg/service/client_kclvm_service.go	0	12	0.0%

Totals
Change from base Build 6733376311:	-0.5%
Covered Lines:	2627
Relevant Lines:	4030

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💛 - Coveralls