phase1,phase2: GitPoller: fix deprecated API warning for pollinterval

Fixes following warning:

 gitpoller.py:103: buildbot.warnings.DeprecatedApiWarning: [3.11.3 and later] pollinterval has been deprecated: please use pollInterval

Signed-off-by: Petr Štetiar <ynezz@true.cz>

phase1/master.cfg

@@ -368,7 +368,7 @@ c["change_source"].append(
         workdir=work_dir + "/work.git",
         branches=branchNames,
         pollAtLaunch=True,
-        pollinterval=300,
+        pollInterval=300,
     )
 )
 

phase2/master.cfg

@@ -179,7 +179,7 @@ def parse_feed_entry(line):
 		url = parts[2].strip().split(';')
 		branch = url[1] if len(url) > 1 else 'main'
 		feedbranches[url[0]] = branch
-		c['change_source'].append(GitPoller(url[0], branch=branch, workdir='%s/%s.git' %(os.getcwd(), parts[1]), pollinterval=300))
+		c['change_source'].append(GitPoller(url[0], branch=branch, workdir='%s/%s.git' %(os.getcwd(), parts[1]), pollInterval=300))
 
 make = subprocess.Popen(['make', '--no-print-directory', '-C', work_dir+'/source.git/target/sdk/', 'val.BASE_FEED'],
 	env = dict(os.environ, TOPDIR=work_dir+'/source.git'), stdout = subprocess.PIPE)