<!--- This environment context section helps us quickly review your PR. 
      Please take a minute to fill-out this information. -->
## Environment

**Liquibase Version**: 4.4.0

**Liquibase Integration & Version**: Maven

**Liquibase Extension(s) & Version**: None

**Database Vendor & Version**: All

**Operating System Type & Version**: Any


## Description

I am using XML changelog with <includeAll> for which path is mandatory in a zip file

```
<includeAll path="" relativeToChangelogFile="true" filter="my.XMLFilter"/>
```

I want to include all files in the directory of the changelog.
1. `<includeAll path="">` => Not working, is resolved to root of the zip archive
2. `<includeAll path=".">` => Not working, path is not normalized and ZipFileSystem does not resolve `myfolder/./` as `myfolder/`

## Steps To Reproduce

PR with unit Test to come...

## Actual Behavior
First case run into stack overflow
Second case does not find any file


## Expected/Desired Behavior
Expected behavior is to have the same behavior as regular file system


## Additional Context
Resolution can be to modify liquibase.resource.FileSystemResourceAccessor lines 237 - 239:

From 
```
                    if (path != null) {
                        basePath = basePath.resolve(path);
                    }
```
To
```
                    if (StringUtil.isNotEmpty(path)) {
                        basePath = basePath.resolve(path).normalize();
                    }
```





while (it.hasNext() && !added) {
                if (!"first".equals(it.next().getRunOrder())) {
                    it.previous();
                    it.add(changeSet);
                    added = true;
                }
            }
            if (!added) {
                this.changeSets.add(changeSet);
            }
        } else if ("last".equals(changeSet.getRunOrder())) {
            this.changeSets.add(changeSet);
        } else {
            throw new UnexpectedLiquibaseException("Unknown runOrder: " + changeSet.getRunOrder());
        }
    }
    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if ((o == null) || (getClass() != o.getClass())) {
            return false;
        }
        DatabaseChangeLog that = (DatabaseChangeLog) o;
        return getFilePath().equals(that.getFilePath());
    }
    @Override
    public int hashCode() {
        return getFilePath().hashCode();