Bump springcloud springboot version to solve cve problems

[shoothzj]

What's the purpose of this PR

Bump springcloud springboot version to solve cve problems

Brief changelog

• Bump springcloud version from 2021.0.2 to 2021.0.5
• Bump springboot version from 2.6.8 to 2.7.8

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• Update the CHANGES log.

[codecov]

Codecov Report

Merging #4712 (5effd3e) into master (d9726af) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #4712   +/-   ##
=========================================
  Coverage     47.21%   47.21%           
  Complexity     1660     1660           
=========================================
  Files           349      349           
  Lines         10691    10691           
  Branches       1062     1062           
=========================================
  Hits           5048     5048           
  Misses         5335     5335           
  Partials        308      308           

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[shoothzj]

@nobodyiam PTAL when you have time, thanks :)

[nobodyiam]

The 2.1.0 version has been tested and is ready to be released after apollo-java 2.1.0 is released.
It seems a lot of changes were introduced in Spring Boot 2.7, how about we upgrade spring boot and spring cloud version in the next apollo release?

[shoothzj]

@nobodyiam +1, let's keep this PR open

[shoothzj]

@nobodyiam PTAL again, thanks

[nobodyiam]

As the default spring security version is upgraded to 5.7.6, I think the spring-security version could be removed.

apollo/pom.xml

Line 69 in a0c09b5

<spring-security.version>5.7.3</spring-security.version>

apollo/pom.xml

Lines 204 to 211 in a0c09b5

	<!-- Spring-security BOMs -->
	<dependency>
	<groupId>org.springframework.security</groupId>
	<artifactId>spring-security-bom</artifactId>
	<version>${spring-security.version}</version>
	<type>pom</type>
	<scope>import</scope>
	</dependency>

[shoothzj]

@nobodyiam PTAL again, thanks

[nobodyiam]

LGTM